Shu Itsuki is a member of the idol unit Valkyrie. Valkyrie consists of Shu Itsuki, Nazuna Nito, and Mika Kagehira. Shu Itsuki is not a good man, he is abusive both mentally and physically over his unit mates. Shu sees Mika and Nazuna as his marionettes and puppets, instead of regular human beings. Shu loves art. Shu is very affectionate most times to Nazuna, but is much more harsh and terrible towards Mika. Shu favorites Nazuna over Mika.