Shukan-bunshun(週刊文春), one of the leading weekly magazines in Japan, reported on May 29th that Ryo Aska(飛鳥涼) had adulterous affairs with Ai Iijima(飯島愛) around 2008. They enjoyed sex using MDMA, an illegal drug.
Ryo Aska is a musician and works as a duo "Chage and Aska" with Chage(チャゲ). "Chage and Aska" is one of the most popular duos in Japan. He was arrested on suspicion of possesion of stimulants on May 17th.
Here are music videos of Chage and Aska.
Ai Iijima worked as a porn star, and then became a TV personality. She appeared on a lot of TV programs, but she retired from show business in 2007.
She died in 2008 at the tender age of 36. According to police reports, she died of pneumonia. However, some people suspects that she died of a drug overdose.
Here is a documentary of Ai Iijima.
Chage and Aska official web site
Ai Iijima's blog