When they were young, the male and female protagonists met by chance in a badminton hall. After a match, the female protagonist was admired by the male protagonist's superb skills. The male protagonist was attracted by the maple leaf birthmark on the female protagonist's arm, so they agreed to come to this gym to play ball every afternoon. One day, the female protagonist had an accident on the way to the gym and lost some memories. The male protagonist lost contact with the female protagonist. The male protagonist kept thinking about this girl until they met again in high school.
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