Henkyou-gurashi no Maou, Tensei Shite Saikyou no Majutsushi ni Naru - Vol. 14 Ch. 60 - The Former Demon Lord Receives a Dungeon Briefing

[andrake]

Funnily it's been almost exactly 30 chapters since this guy last appeared.
He's the older brother of another trainee magician, and he was the Escort Knight of Alice/Iris's sister.
He got demoted to whatever this is after he tried to kill/maim Yuuki in a sanctioned duel.

 

[fight2live]

look, i'm fine with harem. but i hope the soon-to-be porter and/or frontliner could be a male. i want to see Yuuki having a non-hostile interaction with another boy his age. heck, bringing his brother Zeros to join the party could be fun

 

[Chizan]

"Yeah. No one lives for two thousand years, after all, right"... I think we all know where this is going..