Total Recommendations: 1
If you liked
Hagure Yuusha no Aesthetica
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...then you might like
Hundred
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Both of these have a strong male protagonist where he protects the girls. Both are in a school type of setting were training happens. Where they differ is where they get their powers one gets it from coming back from a different world. The other is somewhat human genetics. Been looking for a so similar and found hundred to be an excellent match.