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 (Escalation Heroines).