[3] As a child, he watched a lot of anime and played video games, citing his interest in voice acting through Akira Ishida's portrayal of Fish Eye from Sailor Moon SuperS.

[4][5][6] He credits his friends from junior high school for helping him regain his confidence after they complimented his performance of "So Into You" by Koda Kumi during a karaoke outing.

[5][6] In 2004, he competed in the Yamaha Teens' Music Festival under the name "Noboru Yanagawa" and won the Grand Prix for the Tokai, Ibaraki region.

[10] On November 22, 2006, he released his second single, "Trans-winter (Fuyu no Mukōgawa)", which served as the theme song to the live-action television adaptation of the manga Damens Walker.

[21] He was a featured artist in the song "Oji-sama to Cheek" on Kenzo Saeki and Boogie the Mach Motors' collaboration album, 21-Seiki-san sings Harlmens.

[3] In October, he voiced Ryunosuke Matsushita in the anime Kimi to Boku and also performed the songs "Sora", "Tomorrow" and "Over" for the show's soundtrack.

[24] In 2012, Aoi was cast as Ai Mikaze in the Uta no Prince-sama media franchise, where he performed and sang several songs for the character in the game and anime soundtracks.

[23] After gaining recognition from the success of his role, Aoi released his first extended play, Blue Bird, on January 13, 2013, which contained theme songs he performed for Broccoli drama CDs.

"[29] Alongside of singing and voice acting, Aoi continued participating in stage productions, including playing Sakuya Shiomi in the Persona 3: The Weird Masquerade musicals.

[32] Aoi's fourth single, "Murasaki", was released on September 2, 2015, serving as the theme song to the stage musical Prince Kaguya,[33] which he also starred in as the title character.

[34] On February 3, 2016, he released the single "Zessei Stargate" as the opening theme song to Phantasy Star Online 2: The Animation, in which he also voiced the character Itsuki Tachibana.

[37][38] After changing labels, Aoi released his sixth single, "Innocent", as the opening theme song to First Love Monster on July 27, 2016, in which he also played Renren.

[45][46] In 2019, he provided the narration to Dimension High School and later appeared in the show as Shiro Oide, his first role in live-action television.

[50] On October 10, 2022, Aoi released "Psycho:Logy" as a digital single, which was used as the opening theme of the second season of Pop Team Epic.

[57] In 2016, Aoi appeared and sang in the commercial for Lotte's Lady Borden ice cream along with Yuki Kaji and Kenshō Ono.