In the dormitory of an all-boys school, Mao ends up sharing a room with Hisashi. They make three promises to each other: "Mao won't disclose that Hisashi is gay and has a boyfriend," "Kotobuki won't see Mao as a romantic interest and won't make a move on him," and "they won't interfere with each other's private activities."
Then why do I still feel like 
I'm hung up on something?
Warum hab ich trotzdem
so ein Ziehen in der Brust?
Entonces, ¿por qué siento
como si tuviera algo en el pecho?
Entonces, ¿por qué siento
como si tuviera algo en el pecho?
Alors pourquoi
Allora perché mi sento
questa stretta al petto?
Então, por quê?
Так почему же?..