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."
If either of us violates our promises, 
we shall move out immed—
Wer seinen Schwur bricht,
muss sofort das Wohnheim verlassen.
Quien rompa la promesa,
deberá irse…
Quien rompa la promesa,
deberá marcharse…
Si on manque à une promesse…
Se uno dei due infrangerà le promesse,
dovrà andarsene subit—
Caso quebrada alguma promessa,
logo em seguida...
В случае, если кто-то из нас нарушит
данную клятву…