Kenichi Kanemaki is a screenwriter, lyricist and composer from Tokyo, Japan.
A supernatural system allows people to take revenge by having other people sent to Hell via the services of a mysterious entity and her assistants who implement this system. Revenge, injustice, hatred, and the nature of human emotions are common themes throughout the series.
In the future — in a world mostly submerged under water — the 19-year-old Sumeragi Aika goes to college while training as an agent by assisting in Aida Gozo's salvaging business.
Aika Sumeragi works as a salvager for hire, but gets caught up in a plot for world domination.