One day, cosplayer Risa suddenly trips to a different world. The unfortunate young man in an uncle jersey I met there was a Demon King! Risa, who was about to be killed as an invader in the Demon Castle, suddenly offered to the Demon King “to make a costume that looks better”. I wanted to go back to my original world and complete the outfit, but the Demon King wearing it was changed and for some reason it was strengthened! [That ’s why I was appointed as the Demon King's costume clerk… !? Cosplay different world reform fantasy, long-awaited comicalization!