Fantasy mangas with overpowered main characters in a school setting (Also harem/ecchi included if possible)

[Arin-san]

Best examples (Ones in bold are the best of the best examples) -
Kage no Jitsuryokusha ni Naritakute
Shinju no Nectar
The Reincarnation Magician of the Inferior Eyes
Ore Dake Haireru Kakushi Dungeon: Kossori Kitaete Sekai Saikyou
Parallel Paradise (I mean.. he is kinda overpowered, isn't he? He got the power of his dick)
Maou Gakuen no Hangyakusha

I don't know why but I always read these kind of mangas at the speed of light, it feels so short to me. After finishing them I just keep searching for more but instead end up getting disappointed. I know that the world of manga is vast, I know that there might be more of these kind of mangas out there, but I just can't find them. Help is appreciated.

 

[Arin-san]

Oops my bad, Shinju no Nectar and Parallel Paradise doesn't have a school setting, but they meet all other criteria so I think they should be included as well.

 

[winkookchurro]

Literally type in google " popular manga" and like, 500000000000000etc.. will appear ( just sayin' )

 

[AAA1]

@winkookchurro if you can't recommend something. Don't bother comment (just sayin')

 

[AAA1]

@Arin-san if school setting doesn't included. 'Helck' is pretty op in his world