Mariko Izumo

Meeting Ayumi and Mariko at Yoron Shima, the character becomes involved in a dynamic where Eikichi pursues Mariko, leading to an unexpected shift in their relationship once their true roles as teachers are revealed. After Ayumi departs, Mariko remains a supportive figure, often assisting the main duo in challenging circumstances. She possesses a complex background, being the daughter of a Yakuza leader and formerly associated with a notorious gang.