The World's Strongest Rearguard: Labyrinth Country's Novice Seeker, Vol. 1 (manga)

Workaholic Atobe Arihitohas died and been reborn in "Labyrinth Country" where he's now a dungeon hunter.He enlists in the guild and picks a job title, but while searching for a partyto join, it seems no one wants the help of his bizarre job choice, "rearsupport." He's running out of time to join a group, and when someone finallyapproaches to offer him a job it's...his ex-boss!? Here starts the adventure ofthe strongest supporter!