Ai Ga Omoi Jirai-Kei Vampire

The main character, Shin, works hard to support his older sister and younger brother. One day, on his way home from work, he meets a girl who claims to be a vampire, and she demands his blood...?This is the beginning of a slightly exciting brand new love story!---Note: Serialized version of (https://mangadex.org/title/fb83ba7a-6887-4c72-8d61-1c8d8ff8904f).