A mash-up of multiple genres and yet it's pretty good.
Gideon is a member of the Hero's party but he lacks the necessary raw strength? (the anime doesn't clarify) to stand next to the Hero (who happens to be his sister). Forced to quit the party Gideon decides to run off to a small town, Zoltan, and becomes an Apothacary, where he assumes the identity of Red a mere D-Rank adventurer.
This is hardly the best anime out there BUT like with most anime out right now, it's not Escapist fantasy, with a Protagonist who has a Harem with a 12yo in it. It's a good Christian anime, for all us vanilla people out there.
Have fun watching this unless the last 3 episodes turn out to be bad in that case I'm sorry.