The story of five heroes summoned to defeat the Demon King! However, the protagonist, Fumio Kitajo, is given the hero's power 'Gift' of 'Infinite Bathhouse'!? Can he really fight with this? Who is the idiot that said he could defeat the Demon King with such a power? The person in charge, come out!! However, someone once said, 'It's all about how you use it.' Is this really true? Can he really fight seriously? A fantasy of swords, magic, bubbles, and skin tones in a mixed bath, 'Isekai Kon'yoku Monogatari'! Save the world by taking a bath!