Because she has to deal with guardians and prepare for activities, Shinoya (Aoi Morikawa) has become extremely busy, and even sleeping in has become extravagant. Makino (Fuhei Matsushita) is very concerned about this.Yoshino (and Ran Qianqiu) and Fujioka (Hiraoka Yuta) are also worried about Shinoya, who is serving as the sixth-grade class teacher for the first time. However, Shinoya, who is not good at relying on others, writes more and more % to-do notes.

In Shinodani's class, there is a small group of girls consisting of Reika (Hataka Ichika), Haruka (Saito Momoka) and Mei (Lianggawa Miharu), as well as Rin (Nakata Kouri) who rarely participates in it.However, Rin was unable to integrate into Reika and the others' topics, such as popular lipsticks or traveling to Harajuku, which made Rin feel a little excluded.

It was against this background that because Shinoya confiscated Reika's colored lipstick, Reika's mother rushed directly to the school to investigate!Shinoya continued to suffer from insomnia and loss of appetite. He even found a note in the classroom that said "Anyone who talks to Teacher Shinoya will be tortured to death." Shinoya was exhausted both physically and mentally.One day, on the way home from school, Shinoya happened to see Rin staring at colored lipstick at a convenience store...!