Koichi, a student about to graduate, is summoned to a world of Titans. It's the land of Tildant, where the prince, Caius, appears in front of Koichi and says, "I want you to be my bride and give birth to my baby!"

One day, Koichi, a student about to graduate, is summoned to another world. It's a country of Titans where a much larger race lives. The Prince of the country, Caius, appears in front of him. He enthusiastically sees Koichi and proposes, "I want you to be my bride and carry my children!"—Jonathan Hinga