With her maternity leave over, Shirone is trying her best to balance work and childcare. However, her husband doesn't care about his family, and her only ally is her father-in-law, Tooru... Shirone is Kokoro by his carnal kindness. For her, exhausted from arguing with her husband, the only thing that heals her is Tooru's carnal desire... The two continue their relationship in secret, pressing their bodies together and feeling each other's warmth. However, Shirone knows that this is not good, but she can't stop...