Childhood friend and only daughter of the Archduke Vanyandereinstein family. A high-spec yandere who tries to force marriage through every possible scheme.

Head of the Archduke family. Possesses even greater talent than Therese and is an absurdly overprotective father. He will never forgive anyone who lays a hand on his daughter. He told Guest, "If you touch my daughter, I'll kill you." He added, "If you tell anyone about this conversation, I'll kill you too." ...Your only choice is to run from Therese.

Haerth's legal wife. She finds her husband's exasperating behavior endearing, but if you beg her, she might become your ally...?