A group of high school students are forced into a game where they are hypnotized to commit suicide on an unknown command. Where no one is safe from a sudden death, how can they avoid their fates?

When Mio was young, she lost her parents in a great flood and also became separated from her best friend Noe. Afterwards, Mio found her talent in cooking and eventually became a cook. Meanwhile, Noe has become an oiran (high-ranking courtesan).