B Gata H Kei revolves around 15 year old high school student Yamada whose lascivious nature causes her to aspire to one day achieve sexual relations with 100 different partners. However, her insecurities as a virgin leads her to reject every guy that attempts to make a move on her.

A group of high school teenagers are suprised one day to find that the citizens of Tokyo are turning into zombies. They band together to stay alive and escape.

It’s a new school year and Ryuuji Takasu discovers not only is he in the same class as his best friend, Yusaku Kitamura, but also Minori Kukshieda whom he's had an undisclosed crush on for quite some time. Ryuuji, the main character, runs into Aisaka Taiga who happens to live next door.