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."
B...?
Hä?
-¿B…?
-¿"BL"? ¿De Boys' Love?
-¿B…?
-¿"BL"? ¿De Boys' Love?
B...
«Би»?.. «Би Эл»?
«Бойз лав», что ли?