Makio Kōdai is a shy 35-year-old woman. She works as a novelist. One day, her sibling and her sibling's married partner die in a car accident. Makio Kōdai attends their funeral and meets her 15-year-old niece Asa Takumi, who is now left alone due to her parents’ death. The other relatives at the funeral speak insensitive words around Asa Takumi. Makio Kōdai gets furious at them and decides to take in her niece. Makio Kōdai, who has problems having relationships with other people, and Asa Takumi now begin to live together.

Eripiyo is initially a woman leading a normal life until it is turned upside down after watching a performance of the minor idol group ChamJam, which leads her to becoming obsessed with one of its members, Maina Ichii. Despite Eripiyo's enthusiasm towards her, Maina is consistently the least popular member of the group, leaving Eripiyo to take it upon herself to buy a lot of Maina's merchandise, which mainly involves singles.