Yurika's daughter, Kokoro, is troubled by her relationship with her boyfriend. Though kind and considerate by nature, she is indecisive and somewhat timid, feeling frustrated that she lacks masculinity, which builds up inside her. One day, her frustration explodes and she harshly berates her boyfriend, Teppei. Deeply hurt by her words, Teppei becomes despondent, and Yurika, feeling sorry for him, comforts him. During their conversation, Teppei reveals that he grew up without a mother and has never truly known love. Learning this truth, Yurika is overwhelmed by conflicting emotions—Teppei's gentleness, guilt over hurting him, and her own longing for affection—and begins to develop maternal feelings toward him. Teppei starts to lean on Yurika emotionally, and she willingly accepts his dependence. A bond of mutual comfort slowly forms between them, eventually evolving into mutual desire. However, Teppei decides to break up with Kokoro. Faced with this decision, what will Yurika do? Twisted emotions spiral into intense, passionate sex.