Hotaru builds a small robot from a kit as a free study project, and dresses it as Komari riding a dog. The robot escapes and goes on an adventure. Akane shows up at Konomi's house on the wrong day, and embarrassed by her mistake hides from her with Renge's help. While teaching Renge to play hospcotch, Konomi and then Natsumi show up and mistaking Akane for a wild animal chase her until she ends up like "a slug that found salt". Later she crosses paths with Hotaru's robot that somehow manages to return home. On another day, Hotaru and Komari invite Akane to hang out, and she tells them of her encounter with the "miniature Komari". Things quickly escalate from there.