Similar to 継母の連れ子が元カノだった

Katanagatari

Gakkō no Kaidan (novel series)

Zaregoto

Playing Death Games to Put Food on the Table

Junk Force (manga)

Shū ni Ichido Classmate o Kau Hanashi

Gun Princess

Strawberry Panic!

Dokkoida?!

Sengoku Komachi Kurōtan

Sohryuden: Legend of the Dragon Kings

Sword Art Online Alternative: Gun Gale Online