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He and he have been classmates for many years, and have been bitter enemies for many years.
From their student days to their current employment at the school, the two seemed to have been destined to grow up and work in the same place, closely chasing each other.
He is impatient and slow in everything.
He's a misfit, he's the atmospherer.
The two people's personalities are very different, but... The good and the bad attract each other.
I don't know when it happened, but the hostility slowly changed, and it became quite sweet...