Kenji, the husband who came to his wife Kiyoka's family home to prepare for the birth, found that Kiyoka's father and Iroha, her sister who had divorced a few years ago, were living there. Since Kiyoka became pregnant, Kenji has been repeatedly rejected for sex, causing his sexual desire to accumulate. He became infatuated with Iroha, who had a voluptuous body and exuded erotic pheromones. Unable to restrain himself as he spied on Iroha changing clothes, Kenji, sneaking away from Kiyoka's sight, approached Iroha...
