it's a story about a black haired girl who is really strong sword master and she becomes friends with this girl but the girl is secretly a boy who is like a crazy crown prince or smth
https://www.mangago.me/read-manga/let_s_hide_my_younger_brother_first/This?
it's a story about a black haired girl who is really strong sword master and she becomes friends with this girl but the girl is secretly a boy who is like a crazy crown prince or smth