 If you liked
Eiyuu Kyoushitsu
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 ...then you might like
Yuusha, Yamemasu
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In both anime main character is overpowered hero and stop their hero career but still do something similar as what they did. In yuusha yamemasu, mc quit heroing and join demon army, in eiyuu Kyoushitsu mc joins hero school. They both have fights but also slice of life moments.