Also known as: 冬柱月子, 毒の冬柱月子
Playable character in Choukou Taisen Escalation Heroines.
Known by the epithet Tsukiko The Poison, Tsukiko is the fifth-ranked member of The Seven Vices, an elite group within the Kuze Jogenshu faction. She is one of three senior members in the faction, alongside Touha Taiyo and Akimichi Himeji.