Linda the Share House

Akane and her elder brother Akira have been close ever since they were children, despite their age gap—Akane is now in high school, while Akira has given up his career as a police officer to pursue his dreams in music while living in a shared house with his friends. When Akira fails to turn up to see Akane, a visit to his shared house reveals that he has gone missing, and when the police refuse to investigate, Akane discovers a note from Akira hidden in his room that tells her to get out of the house as soon as possible: his four mysterious house mates are dangerous, and if she stays any longer, she'll end up dead...

(Source: MangaDex)