Kasumi, a 10th grader at night school, spends most of her school hours in the nurse's office. When the school nurse, Sakuma, shows Kasumi's writing to Fujitake, he realizes how much Kasumi struggles to leave the nurse's office. As he creates an opportunity for her to step out, Sakuma grows increasingly concerned about Kasumi, seeing in her a shadow of a student she once knew.

With Taketo, Angela, Kasumi, and Nagamine, the science club is officially established. Fujitake suggests they attend an academic conference where high school science clubs present their research. However, when they visit one of the presentation events, they get overwhelmed by the high level. Meanwhile, Mai, who works in a hostess club, sees that Taketo is unusually down.

The science club reunites and successfully registers for the conference on time. They are selected as one of the 15 schools to give a presentation, but Taketo and Kasumi struggle with their roles as presenters. Meanwhile, Fujitake receives an unexpected offer from Inose, leaving him puzzled. As Taketo senses something is off with his teacher, the day of the conference finally arrives.