Kaguya-sama wa Kokurasetai: Doujin-ban
Spin-off of Kaguya-sama wa Kokurasetai. The manga features raunchier scenarios that do not occur in the main story. It also has AU stories that imagine the characters in different roles (such as fairy tale characters or toddlers at a nursery school). Includes 2 extra chapters.
Kaguya-sama wa Kokurasetai Darkness
Kanojo mo Kanojo Kanketsu Kinen Doujinshi
Kaguya-sama wo Kataritai