The Makino sisters consist of the feisty Natsume, the motherly Akira, the soft-spoken Fuyu, and the innocent Haruka. One week after his wife died in an accident, the household's father, Kenichi, begins to see his four daughters in a manner that exceeds a standard parent-child bond. He soon finds himself unable to resist their attractive bodies, and succumbing to his carnal incestuous urges, he proceeds to have his way with them one by one.