On the night of his favorite game's shutdown, Akira Oono awakens in the body of his online character: Demon Lord Hakuto Kunai.

Together with her humanoid friend Reg, a young girl named Riko hopes to one day solve the mysteries surrounding the endless chasm known as the Abyss.

A young man is transported into a video game world dominated by females.

Hachimitsu Academy, once an all-girls school, has become co-ed, and teen Kiyoshi is one of five boys to enroll. When he is caught peeping, Kiyoshi is sent to the schools prison, where his punishment is carried out.