Chapter 1: Sundown

"It happened one night in one of the dark abandoned alleys of Tokyo.

It repeated one night in the confinements of a small apartment.

It became routine one morning, when the light was blocked out by curtains."

Or Vampir Sakusa meets Human Atsumu while he is half starving and the blonde, he can't help but categorize as a foolish idiot, invites him into his home.
Sakusa is left to wonder if Atsumu knows what he is and if so why he would let him get near him.

Or a vampire with germaphobia who starves because he doesn't want to touch people meets a human who refuses to let him starve.