With kind, beautiful mother Chizuru, protagonist who is son of mother trowing. However a happy home of mother and child, a certain day attacked by super-huge typhoon, it crumbled away with a sudden roaring sound.

Two confined in a house by the landslide, it puts ones efforts together and it awaits for rescue while encouraging it each other. However Protagonist to which mothers masturbation has been tried peeking in the bathroom, it is driven and forbiden relation is connected with the lust.

Though the start was mother and child afflicted because of the consciousness of the crime to which the taboo is violated, the pleasure of the immorality cannot be gradually disputed, it drowns to prohibited pleasure.