Man I really don't like the school parts of this manga. MC is so annoying I just want to skip. The labyrinth stuff is great though. Also hope he changes his reasoning for wanting to be an adventurer soon or at least change girls.
I read webnovel in syosetu just search
モブ高生の俺でも冒険者になればリア充になれますか?
use google will do. It at chapter 22.
There 2 fight before this, including the one in this manga chapter.