Voyeurs, Inc. - Wiretapping [新のぞき屋 盗聴尾行のぞきます]

An erotic mystery based on Hideo Yamamoto's comic of the same title, directed by Takeshi Yokoi Yokoi. A mysterious man eavesdrops on an affair between a teacher and a student at a prep school and harasses him. The teacher asks a member of "Voyeurs, Inc." to investigate.