Otaka was born in Kanagawa, Japan. At age six he was chosen to play the part of seven-year-old Yoichi Asakawa in Ring. Today, he (alongside Hiroyuki Sanada who played Ryuji Takayama in Ring) is the most credited and popular male character in the Ring series. He reprised his role as Yoichi a year after the first sequel Rasen was a failure in the cinemas. In Ring 2, his character was the supporting male actor.
At 9 he worked as an extra and made a notable appearance in the film adaptation of the hit TV series Kamen Rider Agito. He then rejoined Hideo Nakata to play Yuuchi in Sleeping Bride. He made small appearances in Chloe and The Sea Is Watching.
He then starred as the main player in Baseball Kids. He then starred in a drama movie Catharsis as Subaru.
He more recently starred with Ken Watanabe in the drama history film Kita no Zeronen playing the Mamiya's son.
