My mother always has a bright and energetic personality, keeping our home lively and cheerful. My father is working overseas alone, so she's seemed a bit lonely lately. One day, I came home from cram school with a friend named Tatsuya. He was an unusual friend for me—someone with a slightly delinquent vibe, different from the usual crowd. At first, I didn't think much of him and everything felt normal. But then, one day, I was shocked and confused to discover him doing something unexpected with my beloved mother.