This is the story of a boy named Kippei Katakura who did not care about the feelings of others, especially girls, with whom he was to stop flirting and over and over no matter what they felt. But everything changes when Yuzuyu comes to life. Yusuyu is his first 5 years, who, being alone, begins to live with Katakura who later becomes his surrogate mother. Many emotions this character make him reflect on what he did with the girls, especially Kokoro, a quiet girl who is always on the lookout for Katakura.