is a Japanese musician. His professional music career began in 2001 as vocalist of the band Sound Schedule. Following the band's disbandment in 2006, he began a solo career, releasing his debut single "Honoka Terasu" in 2008. Sound Schedule reunited in 2011, with Ōishi returning as the band's vocalist.

Ōishi is also vocalist of the musical group OxT, led by composer Tom Hack. In 2014, Ōishi's song "Kimi Ja Nakya Dame Mitai" was used as the opening theme to the anime series Monthly Girls' Nozaki-kun, and in 2018, his song "Otomodachi Film" was used as the opening theme to the anime series Tada Never Falls in Love. In 2023 his song "Megane Go Round" was used as the ending theme to the anime Suki na Ko ga Megane o Wasureta. He has also written songs for other artists, such as "Yōkoso Japari Park e" which was used as the opening theme to the anime series Kemono Friends.

Early life Ōishi was born in Uwajima, Ehime on January 5, 1980. He graduated from the Kobe University of Commerce (now part of University of Hyogo) and was a member of the school's light music club.

Career

In 1999, Ōishi formed the band Sound Schedule with other members of his university's light music club, making their major debut in 2001. Following the band's dissolution in 2006, he started a solo career, beginning with the release of his debut single on June 25, 2008. This was followed by the release of his second single on September 24, 2008. In November of that year, he released his first album .

In 2009, Ōishi released two singles: "Love" on June 17, and on October 21, as well as his second album .

In 2011, Sound Schedule decided to reunite after a five-year break, with Ōishi returning as the band's vocalist. Although the reunion was intended to be a temporary affair, at the end of the band's tour in 2012, it was announced that the band would continue its activities. Ōishi would remain as the band's vocalist while also continuing his solo career. In 2012, he released his third album .

In 2013, Ōishi released his fourth album . He also began collaborating with composer Tom Hack for musical releases. Their first collaboration was the single "Go Exceed!!" which was released on October 30, 2013; the title track was used as the first opening theme to the anime series Ace of Diamond. This was followed by the single "Perfect Hero" which was released on May 21, 2014; the title track is used as the second opening theme to Ace of Diamond. That same year, he released the single on August 27; the title track is used as the opening theme to the anime series Monthly Girls' Nozaki-kun.

In 2015, Ōishi and Tom Hack formed the musical group OxT. The group's first single was "Kimero", the title track of which was used as the second ending theme to Ace of Diamond. The group has since performed theme songs for anime series such as Overlord, Prince of Stride, and Hand Shakers. That same year, Ōishi also released his fifth album .

In 2016, Ōishi wrote the song , which was used as the opening theme to the anime series Kemono Friends. The song became very popular in Japan, topping Amazon Japan's soundtrack ranking as well as ranking third in the country's iTunes song charts. His own cover received over one million views in the span of two weeks on Japanese video-sharing site Niconico. That same year, he wrote the song by Ami Wajima, which was used as the second ending theme to the anime series Kuromukuro. He released his sixth album on July 13, 2016.

In 2017, Ōishi released his seventh album , which included a cover of "Yōkoso Japari Park e". The following year, he released the single , the title track of which was used as the opening theme to the anime series Tada Never Falls in Love.

In 2018, Ōishi collaborated with Tsuburaya Productions for their 28 entry of the Ultraman Series, Ultraman R/B. Ōishi's song Hands was used as the shows opening, and another song Ultra Sing! was made for the album released to promote the series later in the year.

In 2021 his song "Imperfect" was used as the opening theme to the anime series SSSS.Dynazenon.

In 2023 his song "Megane go Round" was used as the ending theme for the anime The Girl I Like Forgot Her Glasses. He composed and wrote the lyrics to Airi Suzuki's single "Saikyō no Oshi!"; it was used as the theme song to the live-action television drama adaptation My Oshi Is Now My Boss, and Ōishi also made a guest appearance in the drama.

In 2024 his song "Namaramenkoi Gal" was used as the opening theme for the anime Hokkaido Gals Are Super Adorable!.

In 2025, Ōishi returned to compose and write lyrics to "Isshun Kimi Oshi" for Airi Suzuki, which was used as the theme song for My Oshi Is Now My Boss: Full Throttle; Ōishi returned as a guest character for the drama.

Personal life

In 2020, Ōishi announced he had married a woman who is outside of the entertainment industry.

Discography Singles +TitlePeak Oricon positionAlbum Release date: June 25, 200867 Ano Machi Kono Machi Release date: September 24, 200860 Release date: June 17, 200971 G.D. Attraction Release date: October 21, 200986Go Exceed!! Release date: October 13, 201366 OxT Complete Songs TV Anime "Ace of Diamond"Perfect Hero Release date: May 21, 201451 Release date: August 27, 201423 rowspan="3" Release date: March 19, 201851 Release date: May 23, 201830Hands Release date: July 18, 201850Entertainer Release date: November 21, 201855 Release date: August 21, 201928 Entertainer Release date: June 3, 202018 Release date: April 21, 202121 Release date: April 21, 202139 Release date: June 1, 202228 Universe Release date: January 8, 202316 Release date: May 31, 202328 Release date: September 29, 202335 Release date: February 7, 202425

Albums +TitlePeak Oricon chart position Release date: November 26, 2008103 Release date: November 19, 200985 Release date: January 25, 2011116 Release date: February 20, 2013132 Release date: December 2, 201539 Release date: July 13, 201632 Release date: July 26, 201715 Release date: June 26, 201924 Release date: August 25, 202119 Release date: March 23, 2022141 Release date: February 7, 202416 Release date: August 26, 202623

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