Talking chains and walking underwear

Meet Ronald. He is the hero of obsession.

His job was to fight the demon king. All alone.

Thankfully, the demon king is a peaceful guy and instead wants to integrate into society.

Leaving our would-be hero destitute, jobless, and, worse, in jail

Watch him go on adventures as the chains that bind him whisper sweet nothings and his underwear protects him from ROUS (rats of unusual size).

No harem.