Need animu recommendations.
Same feel/atmosphere as pic related.
I'll take them whether good or shit.
I've already seen Grisaia btw.
Closest I have in mind to what you're wanting is Hayate No Gotoku. Tons of action, oblivious over powered protagonist with 70% of the female cast somewhat smitten to him (slowly adding more women because of his childhood stuff) that takes place between school and several of the women's houses.
Only setback is that it's not really too serious and more comedy.
Well your specifications are pretty damn specific, especially the school part.
Maybe Rosario x Vampire. It has everything you want save for an overpowered MC, who in that series gets the ladies through PURE ANIME PROTAGONIST GOOD WILL AND SHEER EVERYDAY HEROISM
...and some hints of having powers beyond his grasp some parts of the story