Talented vs. Talentless

Nōryoku-sha Bāsasu Munōryoku-sha (能力者VS. 無能力者)

Kyōya investigates the cliff where Nanao was last seen. Meanwhile, in the classroom, Nana, Moguo, and Seiya are having a conversation when Kyōya shows up. During lunchtime, Nana follows Kyōya to the janitor's shed where she finds out that he feeds a cat. Afterwards, they meet up in the hallway and he invites her to his room. There, he reveals that he came to the island because his younger sister is missing. 

He also reveals that he found Nanao's watch during his investigation. He then takes her to the cliff to warn her about what is going on. That night, Nana reminisces about the things she noticed in Kyōya's room and decides to set up a trap. The next day, while they are alone, Nana mentions the cat. Later, when Kyōya attempts to feed the cat, the janitor's shed explodes. Nana reveals that she saturated it with gas based on her observation that Kyōya could not smell. When Nana tries to leaves, Kyōya reveals that he survived thanks to his immortality.