 If you liked
Reikenzan: Hoshikuzu-tachi no Utage
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 ...then you might like
Hachi-nan tte, Sore wa Nai deshou!
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Both are:
• Funnny/light hearted
• Have some action/adventure
• Character progression
• OP/ super gifted main character
• Train to get stronger
Reikenzan has a much stronger focus on training and spiritual progress, while The 8th son? Are you kidding me? is more of a traditional isekai anime