Itsu made mo Kawaiku Shiteru to Omou na yo! - Hijiriishi ni Negattara Saikyou no Bishoujo ni Narimashita

Synopsis

I intended to become the world's strongest "man", but I ended up becoming the world's strongest "woman"...?! The adventurer, Lydel, wanted the sacred stone, "Baetyl's Eye", to make him the strongest "man" in the world. The result? Lydel became strongest, but turned into a girl at the same time. In order for her to return to being a male, Lydel embarks on an adventure to find a new sacred stone, but...?