美里和川滨还是和平常一样对待没有了能力的泽木。另一方面，泽木对长谷川的问题“要是一直看不见了怎么办”突然感到困扰。以好友萤倾诉烦恼的事作为契机重新凝视自己的人生的沢木，把自己的想法传达给长谷川。

Haruka thinks that without his ability to see microbes, there is not much reason for him to be at the university anymore, though Kaoru and Takuma stick up for him. Tadayasu seeks advice from Kei, and in the process finds out that despite Kei getting mad in the past for being called feminine, he decided that deep down he was not being entirely honest with himself about his gender identity. Haruka reconciles with Tadayasu later, and at that time Tadayasu regains the ability to see microbes once more.

菌が見えない沢木をかばう美里と川浜。一方、「菌が見えなきゃただのチビ」と沢木を突き放す長谷川。親友・蛍に悩みを打ち明けたことをきっかけに自分の人生を見つめなおした沢木は、自分の思いを長谷川に伝える―