Suddenly summoned to another world, Morikawa Ringo finds herself surrounded by wild beasts and in mortal danger! At that moment, a vampire marquis appears and makes her an offer: “Bear my child.” Shut away in his castle to expand the vampire bloodline, Ringo desperately tries to escape the cruel, cold-hearted vampire—but their bedroom chemistry is second to none…?! Vampire × True Love × Baby-Making?! The dark fantasy begins!