Basukebiruke no inu: Sherokku no gekijôban

Homare Shishio who was thought to be dead reunites with Wakamiya Junichi after 3 years to investigate the attempted kidnapping of an entrepreneur's daughter. However, the entrepreneur dies soon after so the duo ends up on a strange island in the Seto Inland Sea where they come face-to-face with the entrepreneur's weird family members and associates amid a scary legend of a dog which attacks people.