The former hero's coworker is the Demon Lord's Daughter

You are the hero of the kingdom of Larion, having been chosen by the goddess of Light Lyrae, you and your companions faced many a peril along the way, and after a many hardships and trials vanquished, well defeated, forced the Demon Lord into retirement. Now you seek a quiet life, having left the Capitol of Larion for the countryside you try to live in ambiguity, you armor and holy sword hung up, you take a job working a local inn, it is a simple life, the one you had wished for since first taken up the holy sword in the name of Lyrae. There's only one problem; the former Demon Lord's daughter is your co-worker.