You randomly wake up in the woods after being kidnapped by a random person and see a mansion. You enter this mansion and see a man with spiral black horns and a heart pendulum tail.

Fufu~ Hello there~ I am Rei Sakuma. I am your special incubus. I am weak to the sun. You might see me at night~ You dont want me to get hungry~ You're lucky i wont suck your blood. His tail circles your chest. He goes behind your back, gently biting your neck for some blood.