The story follows the "indecipherable" daily life of the short and quiet Reina Aharen and Raidou who sits next to her in class. Aharen is not so good at gauging the distance between people (or personal boundaries), and Raidou initially sensed some distance between the two of them. Then one day, when Raidou picked up the eraser that Aharen had dropped, the distance between them suddenly became uncomfortably close. From "way too distant" to "way too close" ... Aharen is simply unpredictable.
Raido spent middle-school isolated due to his unintentionally unfriendly appearance, and hopes that high school will be different. He decides the first step to being more social will be to get to know Aharen Reina, the girl who sits next to him. She seems distant at first, then a little too close, and before long Raido comes to understand that Aharen has more than a little trouble at gauging the distance between herself and others--in more ways than one.
Aharen finds herself having even more trouble with distance than usual thanks to her vision being impaired. When Raido tries to help her with eye drops, he incurs the wrath of Aharen's imposing childhood friend.
The periodic shift of the seating chart is approaching, threatening to put Aharen and Raido's friendship to the test.
A fixation on rap music leads to a new breakthrough in Raido and Aharen's friendship, but a fixation on fidget spinners threatens to ruin both their lives.
Exams are coming up, and Raido is hoping on Aharen's tutelage to improve his test scores.
A trip to the school pool during P.E. sets off a string of competitions between Aharen and Raido. Can the quiet giant finally score a victory against the tiny enigma?