Romsen SaGa

Overview

In the Kingdom of Bandiera, the royal prophet has announced the incoming resurrection of the Demon King, 500 years after the first King sealed it. Four heroes were thus chosen and sent to the location of the Demon's prison. Meanwhile, Charlie Barett, a modest gate keeper, is stuck at the Royal City with a job he hates, spending his days complaining to his captain and his co-workers; one of which is the noticeably generic-looking Jimmy Monbarn.

Source: AniList