日常を取り戻し、部活動に励む健人（萩原利久）は、家にあったマイ（山下美月）のものを全て処分したと由那（武田玲奈）に伝える。久しぶりに健人と由那は二人の時間を過ごすが、何かに思い悩んでいる由那をみて健人は不安になる。
その頃、校内で妹の存在が噂になり苛立ちを隠せない松井（岡田義徳）は、自宅に洋太（戸次重幸）が訪ねてきたことから、軟禁していたマイを放送室に避難させた。そして、ある人物を消せと指示を出す…
Kento (Hagiwara Riku), who has returned to his normal life and is working hard at club activities, tells Yuna (Takeda Rena) that he has disposed of all of Mai's (Yamashita Mizuki) belongings at home. Kento and Yuna spend time together for the first time in a while, but seeing Yuna worrying about something makes Kento uneasy. Meanwhile, rumors about the existence of his sister are spreading at school, and Matsui (Okada Yoshinori), unable to hide his irritation, has Mai, who has been under house arrest, evacuate to the broadcasting room after Yota (Totsugi Shigeyuki) comes to visit him at home. He then gives orders to eliminate a certain person...
