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."
I only know what he's like in our room. 
I have no idea what he's thinking.
Ich weiß ja nur,
wie er zu Hause drauf ist.
Io so solo com'è nella nostra stanza.
Мало ли что у него на уме.
Мы ж видимся только в комнате…