Junnosuke Taguchi, a former member of male idol group Kat-tun, pleaded guilty Thursday to possessing marijuana in the first hearing of his trial at the Tokyo District Court.

His partner, former actress Rena Komine, who faces the same charge, also entered a guilty plea. The two said there was "no mistake" in their indictment.

Prosecutors sought a six-month jail term for both, claiming they have used marijuana for some 10 years and there is a high likelihood they will re-offend.

The trial concluded Thursday and the court is due to hand down a ruling July 30. The defense is seeking a suspended sentence.

The 33-year-old Taguchi, wearing a black suit, told the court that Komine, 38, introduced him to marijuana and he began using it for stress relief.

"I betrayed my fans and people around me as well as myself. I want to rehabilitate and lead a decent life," he said, adding he wants to continue his acting career and maintain his relationship with Komine.

Komine said she suffered from sleep and eating disorders due to harassment she received after her relationship with Taguchi was reported by media, and she began using marijuana as a way of coping.

According to the indictment, Taguchi and Komine were found in possession of about 2.2 grams of marijuana on May 22 at their Tokyo apartment.

They were released June 7, two days after being indicted, on bail of ¥3 million each.

Kat-tun was created by top talent agency and production company Johnny & Associates Inc., whose founder Johnny Kitagawa died Tuesday.

Taguchi left Kat-tun in March 2016, 10 years after the group released its debut CD, to pursue a solo career.