Why was the family erased?

One day, Hikari Seno questions her professor about her classmate who suddenly disappeared 3 weeks ago.

Genre: Drama, Mystery, TV Movie
Director: Shunsuke Morita
Cast: Tomohisa Yamashita, Mizuki Yamamoto, Kei Tanaka, Yōsuke Asari, Takashi Nikaido
Country: Japan