The protagonist, Kaito Shiga, lost his mother at a young age and adored his stepmother, Sayo Shiga, as if she were his real mother. His stepmother was so beautiful and charming that he could be proud of her. His admiration for Sayo gradually turned into love. Although he was disturbed by his forbidden feelings, he found himself staring at Sayo more and more every day. Kaito, who was troubled, had another concern.

It was about his classmate's mother, Tamae Kudo, who was the PTA president. Tamae would make Sayo help with PTA errands and would scold her every time. Every time he saw Sayo being scolded, deep in his heart, he felt more and more resentment towards Tamae. For Kaito, who was prone to feeling down, the one who helped him to relax was Nao Noguchi, the owner of the coffee shop "Hoshi no Kakera". Nao, who opened the current coffee shop after her husband passed away, is a naturally cheerful and caring person who helps Kaito talk about various things.

A woman he has a crush on. A woman who makes him feel irritated. A woman who makes him feel at ease. A summer surrounded by three beautiful mature women who make Kaito feel good in various ways begins now.

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