A man whose father didn't love his mother met a girl who lost her mother when she was young. He was originally indifferent and was illuminated by his little sun, and he was her ray of light.
From the time when six people in their first year of high school met each other to the time when they met again in their senior year, everything was the best arrangement.
Concept: Mutual redemption of the protagonists, self-reliance and self-reliance, not relying on anyone