Sibling love~
The female protagonist is seven years older than the male protagonist. If you can't accept it, don't watch it.
The male protagonist was abandoned by his father, and the female protagonist raised him during his three years in high school.
Reunited many years later, he leaned over her ear and said with red eyes, "Sister, I just like you. What can I do? You can't reject me anymore."
Mission: Everything is possible