Hitotose Chitose is now living together with his 5 teachers as his mothers when a mysterious girl appears and becomes their neighbor which turns out that that person is Nagatsuki Kuron who wants Mu-chan to be her mother so another sibling rivalry ensues as to who would end up as Mu-chan's child.

Catian Eris is now on a mission to learn about Earth games and how they are played, but she seems to think that bets have to be placed every time. And while some bets are material items, eventually the Catians learn about betting items of clothing...

Fortune Arterial's story revolves around the male protagonist Kohei Hasekura, who transfers into a prestigious public school in the style of an English six-year school encompassing junior-high and high school students. The school is on an island named Tamatsu Island off-shore from mainland Japan, and the only way to get there is by boat. Soon after transferring, he discovers that one of the student in the class next door to his, Sendo Erika, is in fact a type of vampire.

Kitarou, a ghost, spends his afterlife helping humans in need of his skills. He thwarts the plans of evil spirits who live to torment humanity. This time, Kitarou's friend Megumi is in need of his help. Her father, a botanist, went to Baruru Island to study the plant life there, and was subsequently kidnapped by evil spirits. It's up to Kitarou to save him.