he lost his brother Ritsuka Aoyagi has become a completely
different person, or so his psychotic mother says. One day
Ritsuka's life changes forever when outside the school gate
waits Soubi, an 'adult' who is from Seimei's past, who has
come to change Ritsuka's life forever. Soubi claims to be
a 'fighter unit' who 'belonged' to Seimei, and also that he
is in love with Ritsuka.