Seki is digging into his desk as their is archaeological excavation site in the middle of his desk and has found an ammonite fossil. He continues to excavate and makes a major discovery and begins to clean it up. Rumi tries to ignore Seki's antics, but checks back in when he stop making sounds and sees a complete skeleton of a primarily bipedal dinosaur (I am not a palaeontologist) which has been named "Sekisaurus". Rumi is initially impressed, but then remembers that Seki probably buried the skeleton himself (a complete dinosaur skeleton is incredibly rare), although thinks that there might be something buried under her desk and begins digging with her compass. She only stops digging when her friend comes to take the next lesson and when she explains that she was looking for fossils like was with Seki's desk, only his desk is completely clean and now is completely embarrassed and swears the friend to secrecy.

Seki is wearing glasses, which surprises Rumi as he wasn't wearing any on the way to school. He is also looking into a mirror and his 'game' for this lesson is glasses shopping (truly riveting). Rumi thinks dark, thick-rimmed glasses suit Seki and displays her approval when he wears a pair that matches that description, also she gets visibly frustrated when Seki tries on glasses that aren't dark and thick-rimmed but stops reacting whenever Seki would look her way. Rumi's preferences get through to him and he chooses a pair of dark, thick-rimmed glasses that he never wears again much to the annoyance of Rumi.

Seki has got both shogi and black chess pieces out play, whilst his class watches a video about the harmful effects of tobacco so the classroom is plunged into darkness. The chess pieces blend in the darkness and pick off the shogi pieces one by one until only the King piece is left. However, some of the 'defeated' shogi pieces reappears as after being unable to stop the chess pieces with her rubber, Rumi is picking up the fallen (in more ways than 1) shogi pieces and putting them back on Seki's desk making them some form of undying force. This freaks Seki out as he is scared of the occult, so he puts the shogi pieces away and presumably stops playing, although Rumi doesn't escape unpunished as a corner of her skirt gets caught under Seki's chair which pins her down.

Seki has a book on palm reading and is reading his palm and his fortune is something to smile about. He seeks another palm to read and has a pair of opera glasses to see those palms that are further away such as Rumi's. Him staring is too much of a distraction for her, so Rumi reluctantly offers her palm for him to read and he does but doesn't tell her her fortune. When she demands answers he flips to a page in the book that states: "Luck starts and ends in one's palm. Even the most unfortunate lot can be changed by one's hands. Please do not forget this.". Unsatisfied with the answer provided, Rumi attempts to check the source, but Seki puts his book away in his bag to prevent Rumi from getting it, so she puts her hand in the back and removes all books inside which are all on fortune telling. Just then, their teacher comes by and catches Rumi with the books and she realises that this is a good chance to punish Seki, so she confesses to reading the books and not following the lesson, which gets her 'punished' by having said books confiscated.

Rumi is off sick with a cold and Goto feels glum about not being able to be near her friend, Rumi, during art class. Another person who is glum, according to Goto, is Seki who today is playing with a paper sumo set and the first match is a sumo wrestler versus a robot sumo wrestler. 'Human flesh' is no match for the strength of steel and the sumo wrestler gets hurt and needs to be bandaged up. Goto has interpreted Seki's actions to mean that he and Rumi had a mother of all lover's quarrels that has made Rumi physically sick and Seki mad enough to play with a childish toy during class to fill the hole in his heart where Rumi used to reside. Meanwhile, the sumo wrestler has his 2nd match and it is up against a robot sumo wrestler with caterpillar treads that run all over the sumo wrestler. After some more bandages the third match is up and the sumo wrestler is up against a wrecking ball machine and is taking some serious hits which Goto interprets as Seki torturing himself over the fight he and Rumi supposedly had. Goto is failing about in an effort to come up with a solution to help the 2 lovebirds rekindle their romance and kicks the stool that Rumi normally sits on into the the table in front of it and subsequent vibrations knock over the wrecking ball machine and causes Seki to believe that he is being haunted by the spirit of Rumi and put the paper sumo set away and begins following the lesson, while Goto believes he has seen sense and has realised that he can still rescue his relationship with Rumi.

Seki is creating a flip book, but this no ordinary flip book as there is text and and recorded dialogue. This piques Rumi's curiosity, so during lunch she rushes bck to the classroom to play the flip book along with its sound. The book starts off with a person on the ground running whilst holding something before transitioning to a bird flying in the sky. The audio track provided plays the sounds of footsteps for when the person is running and the screech of the bird when it appears, meaning Seki wasn't recording dialogue, but instead sound effects. We switch back to the person on the ground and the object they were holding is a toy plane which starts up and begins flying (with some help from its owner). A song begins to play (not sung by Seki, much to Rumi relief), with the lyrics written down in the flip book, as the plane gathers height and is followed by the bird from earlier. The animation ends with the slogan from a local model store, Toyama Models, being spoken along with its name being shown because this animation is a commercial for Seki's favourite model store which he frequents about twice a week.

It has snowed a significant amount, so Rumi has set off and arrives early at school where she spots Seki having made a snow bunny sculpture. Seki carries the snow bunny to a small pond on the school grounds, which has frozen over, before placing the bunny in the middle of the pond and begins breaking the ice to try and drown the bunny. Horrified at Seki's callous actions, Rumi throws a snowball at the back of Seki's head, which forces him to run off and allows Rumi to save the bunny, even if she nearly drowns it herself. She finds a safe hiding spot for the bunny, but before she can leave, Seki has returned with ski goggles and snowballs, determined to get revenge on the person who sniped him with a snowball earlier. Rumi wraps her scarf around her head and engages in battle with Seki, but soon realises she is outmatched and leaves with the snow bunny and manages to lose Seki. She meets up with her friend Tomoka and asks her to do 2 things: 1, throw a pile of snow she has been carrying (decoy snow bunny) and 2, give her scarf to Rumi. When Seki enters the classroom, he notices Rumi and her scarf, which is a different colour than the person who through snowballs at him and moves onto his activity for this lesson: carving 2 penguins and a polar bear out of snow, so the polar bear can terrorise the penguins. Rumi's day has just begun!

Today, Seki is carving up a rubber to make it into a stamp and he is being extra careful as he sitting next to Uzawa, who is sure to unknowingly wreck what ever Seki is planning to do. Seki then makes a signature stamp (a circular stamp that stamps the Kanji for Seki's name) but can only marvel it for so long as Uzawa starts poking around Seki's pencil box, looking for something to waste time with as he is bored. He initially finds nothing, but then discovers and ink pad and puts Seki's finger in it and pushes them down on his notebook akin to what Police do with suspected criminals. Uzawa leaves Seki alone (he's now bored) so he can to wipe his hands clean of the ink and chisel a case for his signature stamp out of another rubber. Pleased with his latest creation, Seki lets his guard down, allowing Uzawa to take out of his hands to rub something out, only for it to break, emotionally wounding Seki.

Seki has brought a toy remote control car with him, but is not playing with it as he is instead studying - road signs that is. Today's game is obtaining a driver's licence and having passed the theory test (marked by himself), Seki moves onto the practical test and sets a small course on his desk. He starts off by checking the toy car is in a safe condition before heading off. He negotiates a S-curve without any issue, but it takes 2 attempts to get round and L-turn. The next point of the test is a hill start which he fails as the car tumbles down the hill and puts everything away as he has failed the test and you can only take once a day. The next day, Seki attempts the test again and is determined to pass as he has done some intensive training the night prior. We resume with the hill start, which he passes and in celebration of getting his 'licence' raises his arm in the air which volunteers himself to answer a problem on the board at the front. He then offers Rumi the chance to get her licence, but she refuses.

Seki has a bunch of magnets and is using them to simulate a game of baseball, which has Rumi's seal of approval. After the game is over, Seki takes 1 of the magnets and sticks a number on the back of it and puts the rest of the other magnets away and gets some other, which look a bit more weathered as they are main team and not a practice squad. The new magnet gets put though its paces and fails to deliver, so is forced under a large magnet. Rumi begins to free this magnet from its current predicament before realising that being under the large magnet will increase the new magnet's magnetic strength, so backs off. The new magnet returns to training and is a lot better, maybe too much as one of the balls bounces off a magnet and hits Rumi in the face, angering her and stopping play.

It is a Sunday and Rumi is walking through the park on her way to do some shopping when she spots Seki taking photos - fake UFO photos to be exact. Also, Seki hasn’t come to the park alone as he has his younger sister along with him although he doesn’t pay any attention to her (he’s more interested in documenting fake abductions of cows by fake UFOs). His sister climbs up the tree the UFO is hanging off of to get in his line of sight, but she ends being nothing more than something to hang another UFO on which is trying to abduct the same cow as the first one at the same time. Annoyed at her brother, (a sentiment which Rumi can relate to as she too has an older brother) she climbs down and heads to the sandpit where she sculpts a landed UFO and an alien body with no head because her head can become the head of the alien. Seki still ignores her and this lack of attention makes her begin to cry, so Rumi steps in and praises her on her sand sculpture as well as play with her which sees her pretend to be an alien. Seki’s sister runs off to get her brother, so Rumi quickly disappears because she can’t have Seki spot her.

Rumi is in the teacher’s office as her teacher is concerned about her focus in lessons and test results. She thinks about snitching on Seki and blaming him for her lack of focus, but the inevitable awkward tension between the 2 that would occur is something she wishes to avoid (I think Goto is right, you do love him), so holds back but there going to be a bag inspection during home-room later in the day, so Seki can be caught and told off that way. Rumi knows about this as 2 teachers discuss it in the office not cognisant of a student in the same room as them. Come home-room, Seki has got the Robot family out to play and they packing for a field trip as the focus of home-room is the upcoming Social Studies field trip. Once their teacher has finished his explanation, he moves onto the bag inspection and Rumi would have smirking under Seki’s impending doom, but she likes the Robot family and fears for its safety if Seki is caught with them. She tries to communicate the impending bag inspection to Seki, but he interprets it as inspecting one’s backpack for the field trip although he finally clocks on and begins to hide all of his stuff (the old box and rope hung out of a window trick). Seki hides Mum-bot and Kid-bot with his lunchbox, so it appears to be a double-tiered lunchbox but there’s no room to hide Dad-bot. The teacher arrives and Rumi can’t see Dad-bot, but then spots him hanging from the back of Seki’s chair out of sight of the teacher. Seki passes inspection, but Rumi doesn’t as she has a CD that she borrowed from Tomoka and it gets confiscated, much to the surprise of Seki.

Seki is doing a traditional Japanese tea ceremony today and once he makes the tea, he drinks it. After drinking, he spots Rumi staring and he makes some for her and hands her the cup (he wiped it down). After some initial internal hesitation, she accepts the tea in the proper manner and enjoys it despite its bitter taste. Seki then makes some tea for Maeda but he refuses it so Rumi drinks it instead , although this comes back to bite her as during a time reading aloud to the class, she burps.

Seki is panning for gold, which Rumi assumes is fake but is very real to him. He eventually gathers enough gold dust to make is own bar of gold, using a tiny mould, a tiny presser, and his own strength. Happy with one bar, he begins panning for more gold to make more bars, but during this panning session, he notices his bar has gone missing. He suspects Rumi to have taken it, but the accusation bring her to tears and he backs off, only to find the bar stuck in the right cuff of his shirt sleeve. He takes the gold bar and throws it outside before moving onto a new game that incorporates bowling.

The first bonus chapter sees Seki completing a transaction with delinquent student (Rumi’s words, not mine) for which the payment is a Yakisoba sandwich from the delinquent student.
The second chapter is Rumi telling Goto how to deal with boys when they anger you. Goto then asks if she ever gets mad at Seki and the answer is yes, but it is nothing that will wreck the relationship they have.
The final chapter is autobiographical and is about the work space Takuma and his assistants work from as well as its more permanent residents (a mouse) and the time he encountered his fellow tenant, so to speak.