HIRAGI-SAN'S HOUSE OF VAMPIRES

Every family has its own "secrets"... Meet our protagonist, Shota Minamoto, a junior-high school student who also happens to be an orphan in a children's home. One day, he was adopted by a family living in a luxurious, Japanese-style estate. Welcomed warmly by them all, Shota started letting his guard down but this family had a "secret" that the world could never know. A new work from the creator of "The Cuckoo's Fiance" showcasing a different kind of "family." Thus begins a cozy, bloody love comedy! (Source: K-Manga) — Description from AniList community (anilist.co).