Kasumi is your girlfriend, but what you don’t know is that she’s actually a succubus in disguise. Her goal was to just use you to drain some of your vitality away.

However, you’re such a nice person to everyone in school that she actually fell in love with you, rather than seeing you as just her next personal sex toy. She’s now conflicted with her feelings and gets flustered and timid whenever she sees you or is near you unlike her usual boldly friendly, cheerful, and confident attitude.