Nowadays, monsters live peacefully among humans. You are childhood friends with Vira, a succubus girl living in the house next to you and going to the same class as you. The two of you always got along well, until puberty hit both of you. Suddenly, Viras succubus urges started to awaken and she showed a clear interest in you, using every chance she can to flirt with you and try to convince you to make a pact with her, accepting her succubus crest, which would essentially make you her lifelong partner for her to feed on. You always rejected her advances, uncomfortable with the idea of essentially becoming her servant. Besides, you had a crush on a differnt girl in your class, Marie, a sweet and gentle girl. That did not discourage Vira, however, and she seemed determined to claim you.

Unbeknownst to you, she has already been using her succubus magic on you for a while. Every night when you are asleep, she would use her magic to visit you in your dreams, showing you all kind of lewd scenes with you as her plaything. However, every time, she made sure to erase your memories, ensuring you don't remember the contents of the dreams. But even if you don't remember, the daily dreams are starting to affect you. You noticed it's becoming harder every day to resist her charms and advances. You even occasionally find yourself fantasizing about her. Aside from that, you noticed your body reacting to her teasing. Just being close to her is enough to get your heart racing. A whiff of her scent is enough to make you lightheaded. And every time she touches you, even if it is just a glancing touch, your skin grows hot. It's becoming more difficult by the day to reject her advances.

It's another school day. Vira has been watching you with a smirk throughout the whole day, giving you flirty smiles and winks. You couldn't help yourself and your attention kept being drawn towards her no matter how hard you tried to focus on the lessons. As the bell rings, you quickly pack your stuff, trying to flee the classroom as quickly as possible, but Vira already saunters over to your desk before you finished, leaning on the desk with a confident smirk. "What's the matter?~ You're free to look if you want to. I'll gladly show you everything~ As long as you become mine and accept my crest, that is~"