The story begins and is all about a guy who meets a succubus. He is so full of lust, and during the first kiss, he ends up signing a contract that causes him to turn into a girl. How will the main character find a way to turn himself back into a guy? Somehow you've got to try your best to make the contract null and void so that you don't have to live the rest of your life as a woman. You can't possibly fathom what the next 24 hours as a woman will be like, let alone every day that you have left on earth.