One day, his mother Shihori comes home soaking wet from the rain. Yuichi (her son) gets excited seeing her clothes clinging to her body and dripping with water. When he brings a towel to Shihori who has gone into her room to get changed, he peeks at his mother's erect nipples! Since then, Yuichi has been thinking about his mother so much that when he sees her sleeping defenselessly, he can't contain his desire... He timidly reaches out to his mother's nipples...