Hiroto Ikuta, 29, lives in Asagaya, spending his days at a part-time job and chatting with locals. He especially enjoys visiting Hanae Wada, a grumpy but kind elderly woman he calls "Granny." Sadly, Hiroto's time with her ends when she dies of a heart attack. Surprisingly, Hiroto inherits Granny's house since she never married or had children. Three months later, 18-year-old Natsumi Kobayashi moves from her hometown to attend art school. With nowhere else to go, she stays with her cousin Hiroto, whom she hasn't seen in years. Despite their clashing personalities, the pair begin living under the same roof as they navigate their seemingly ordinary lives.