On the 9th of this month, the body of a 17-year-old high school boy was found at Lake Hamana in Kosai City, Shizuoka Prefecture.It is believed that the high school student had been in trouble four days earlier by tipping over his motorcycle at a friend's house in Hamamatsu City. It was learned through interviews with investigators. Police arrested five people between the ages of 17 and 21 on the 20th for assaulting a high school student and imprisoning him in a car, and are investigating whether they are related to the incident.

On the 9th of this month, the body of Saito Ukawa (17), a second-year high school student from Fukuroi City, was found at Lake Hamana in Arai-cho, Kosai City, Shizuoka Prefecture. Police believe that he had been beaten and then drowned, and are investigating the matter as a murder. I am.

Police are investigating the details of his whereabouts, but suspects Oto Horiuchi (21), an unemployed man from Hamamatsu City, and Otoo Horiuchi, 18, are accused of assaulting and injuring Saito in the early hours of the morning on the 5th of this month. The suspect, a Philippine national, and three 17-year-old boys from Hamamatsu City and Iwata City were arrested on the 20th on suspicion of causing bodily harm and confinement.

According to the investigation so far, Mr. Saito left his home at around 7pm on the 4th of this month, telling his family that he was going to play, but in the early hours of the next day, the 5th, he returned to a friend's house in Hamamatsu City. Interviews with investigators revealed that he appears to have been in trouble by causing his motorcycle to fall over.

The five people arrested are believed to have been with Saito at the time.

Police are investigating whether the incident was related to the incident or what led to the death.