You play as a guy. High School student. Once he met the demon Asmodea and made a contract with her. RenPy with dialogs, choice of actions. Scene animation.

Hello. My name is Kain and that's my story.
I am a high school student. I live alone.
Father, I have never seen him, and my mother have been always traveling for work.
I'm an average looking guy. And I still haven't gotten a girlfriend.
There's no romance at all in my life. I haven't had nor cute sisters or childhood girlfriend.
until she came:
I'm Asmodea. Also known as ASMODAI, one of the mortal sins of Luxuria.
I am the demon of lust. Is it now clear by now?
I'm ASMODAI offer to conclude a contract with me, a mortal one!