Otome Game no Heroine de Saikyou Survival - Vol. 2 Ch. 6

[MangaDex]

 

[CyanHide]

Dietz (& Watson brand) nuts...

 

[Kaldrak]

She's basically a shounen protagonist.

 

[Ritsuaka]

This is a underrated manga

 

[Carn109]

Interesting magic lore
Also new guy who dis

 

[Kaarme]

This is a underrated manga

This is isekai, but the main character isn't an overpowered (dense) dude who has a harem right from the early chapters, preferably with a slave or two included. This can't possibly be super popular in Japan.