Zach no Koi

As the vampire Zach nears the end of his search for his lost love, he finds himself looking upon an old house in the middle of a quiet Japanese town. In it reside 3 people — an old lady and her granddaughters. Despite sharing neither their lifespan nor their sense of values, he decides to live with them. And as time goes by, he learns what it means to be human, leafing through the stories in the life of the woman he holds dear.

(Source: Kodansha, translated)