Yura Yamato has just arrived at the high school division of Stella Women's Academy, when Sonora Kashima invites her to join a club called "C³". Sonora is the third-year student who became the new head of this club for military survival games. The other members include two second-year students (part-Japanese Karila Hatsuse and G36K-wielding Honoka Mutsu) and two other new students (Rento Kirishima whose family runs a Japanese sweets shop and the really short Yachiyo Hinata).

Second year high school student Koguma doesn't lead a very interesting life. She has no parents, and no friends nor hobbies to keep her daily life busy. One day, she acquires a second-hand Honda Super Cub motorcycle and rides it to school. As time goes by, not only does Koguma have a new adventurous life, but she also forges precious friendships thanks to her precious little motorcycle.

5 Dream Sequences, dubbed his Delusions. Wet dreams from the imagination of a healthy young male.

Seto Ichitaka has a crush on Yoshizuki Iori, a girl in his class who has become so popular she now has her own fan club at school. But only a miracle could make him be with her, since the day he first saw Iori-chan, Ichitaka has been too shy to even talk to her. This miracle happened and now he and Iori are working together on the Freshmen Welcoming Party. It seems that things start to look bright for Seto, but then a special childhood friend is coming for a visit...