In the case of the arrest of a former instructor of Yotsuya Otsuka, a major junior high school entrance examination cram school, for forcibly making a female student look obscene and taking voyeuristic photos, an interview with the Tokyo Metropolitan Police Department revealed that the former instructor seems to have written a novel with content very similar to the modus operandi in this case. The Metropolitan Police Department is investigating a link to the incident.

Takasho Mori, 24, who worked as a lecturer at Yotsuya Otsuka, a major junior high school entrance exam cram school, was rearrested in September on suspicion of forced obscenity and other charges for forcibly spreading his legs and taking voyeuristic photos of elementary school girls at a cram school building in Tokyo.

He has admitted to the charges.

Subsequent investigations revealed that in a novel that a former lecturer apparently wrote when he was in college and published on an Internet site, there was a description similar to the modus operandi in this case, such as a cram school instructor committing obscene acts and voyeurism on his students' students.

The novel also involved kidnapping children and committing obscene acts.

The Metropolitan Police Department is investigating a link to the incident.