Houkago, Famiresu de, Class no Ano Ko to.

Story

Narumi Kouta is a second-year high school boy. When his mother remarried, along with a new father came a talented step-sister. Unable to adjust to his new life, he took a part-time job to get out of the house, and he spends his time at a family restaurant until closing time before going home. One day, Kouta notices that there is a girl from the same school as him, who is also there killing time at the same seat every day, just like him. Her name is Kazemiya Kohaku. She's a celebrity at Hoshimoto Gakuen High School.

Synopsis via AniList (English).

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