Sazanami Sou, a high school honor student with the appearance of an angel, has a dark side. That being… his tenshi-kei VTuber alternate identity, Belle Arianette. Sou has a hard time showing his true personality at school, but when he is Belle, he can truly be himself. One day, Belle and his partner Dia, a demon-kei VTuber, decide to collaborate IRL for the first time. The one who shows up at the meeting turns out to be his loner classmate, Amagaya, who is rumored to be a delinquent! Sou is put off at first, but Amagaya asks if he would go out with him...?