After many arguments between the couple, his wife finally ran away from home. Atsushi was at a loss, but his wife's sister, Rin, came to check on him and offered to give him advice. After learning the secret to keeping a good relationship between husband and wife, Atsushi promised to repay Rin as a token of his gratitude. Having agreed without thinking, Atsushi ended up paying her back with his body that night...