The boy named Ulysses' greatest wish in life was to become a respected priest. However, in a chance encounter, he became the heir to the Demon Lord chosen by the "Cursed Book." From then on, his fate took a 180-degree turn. His self-proclaimed "hero" fiancée, the cute demon maid guarding the "Demon Lord's Book," the witch whose magic is terrible but swordsmanship is excellent, the saintess with divine powers... One after another, beautiful girls with distinct personalities began to appear by his side.