Orangestar is a Japanese Vocaloid music producer and composer. He began uploading songs to Niconico in 2013.^[3] In 2015, he released his first album Unfinished Eight Beats at the age of 17, and the album topped at rank 45 in Japan according to Oricon's weekly charts.^[4][3][5] Orangestar stopped his musical activities for about two years starting from 2017 due to his missionary responsibilities as a mormon and became active again in 2020.^[3][6][7] Later that year, he married illustrator Kase (Japanese: 夏背).

Orangestar was born in Japan into a Christian household. He started going to church at an early age.^[3] His father suggested that he learn to play the piano. Orangestar did not like it much, but continued playing until he graduated from middle school.^[4][8] He then went to Tsudanuma High School, a music high school in Chiba, for a year.^[9] During his one year of high school, he got to know Vocaloid music through his friends, while his father bought him DAW software, including Cubase.^[8] After hearing music made by Vocaloid producers such as 40mP and DECO*27, Orangestar wanted to make his own songs heard as well. He uploaded his first song "ノラボク" during spring break in April 2013 on Niconico using the handle "Orangestar".^[3][4]

During the summer of 2013, Orangestar met M.B, a game illustrator who also goes to The Church of Jesus Christ of Latter-day Saints. This encounter started a years-long partnership between them, beginning with M.B drawing the artwork for "Mikansei Time Limiter", a song published in February 2014.

In April 2014, Orangestar left his Japanese high school and moved to Utah with his family in order to study English.^[7]

During the summer of 2014, Orangestar posted "Earphones and a Chorus of Cicadas" and "Night Sky Patrol of Tomorrow", which both gained attention.^[3][7] Orangestar being a high school musician also became a hot topic.^[3]

In April 2015, Orangestar released his first album Unfinished Eight Beats, which ranked 45th in Japan on Oricon's weekly chart.^[5] He was a 17-year-old at the time.^[4]

In 2016, in additional to publishing several songs online, Orangestar composed "Shinsyosinkirou" for Chunithm, an arcade rhythm game.^[10]

Orangestar's second album, Seaside Soliloquies, was released on January 18, 2017. The album ranked 26 on Oricon's weekly chart.^[5]

Snow Miku, a Vocaloid themed annual festival, took place in February 2017 featuring "Star Night Snow" by n-buna, another Vocaloid producer, and Orangestar.^[11] This is their first collaboration, though they have listened to each other's songs and known each other for a long time.^[12][8] Their names often appeared side by side because they were both teenagers and both produced summer-themed songs.^[13]

In April 2014, Orangestar hosted his first live in 上野音横丁, Tokyo.^[14][15]

In August 2017, after releasing the song "Kaisei" as a part of Hatsune Miku's 10-year anniversary album "Re:Start", Orangestar stopped his musical activities and moved to Riverside, California to become a mormon missionary.^[16][17][7] Two years of silence followed. At the end of 2019, Orangestar announced his return to music production and released "Sunflower" in April 2020.^[6]

In December 2020, Orangestar and illustrator Kase announced on Twitter that they have gotten married.^[17][18][19] Kase had written the lyrics, drawn the illustraion, and sung the vocals for Orangestar's April 2020 song "Sunflower".^[17] She will continue to play a role in Orangestar's songs after their marriage.^[20]

Besides continued online presence, Orangestar wrote songs for rhythm games, anime, and promotional videos. Mobile rhythm game Hatsune Miku: Colorful Stage! commissioned Orangestar to write an original for the mobile game, resulting in the creation of "霽れを待つ".^[21] "Overseas Highway", composed by Orangestar and sang by Wolpis Carter, was selected to be the ending theme song of Digimon Adventure:, a 2020 anime belonging to the Digimon series.^[22] This is the first time Orangestar has written a song for an anime; he claimed that he has watched the first Digimon as a child and thus felt strange writing the theme song for the series.^[23] Orangestar also wrote the song "Surges" for a 2021 promotional video of CalorieMate, an energy bar brand made by Otsuka Pharmaceutical. The video depicts student athletes' practice interrupted by COVID-19 and eventually resuming with explosive heat in the summer.^[24] Orangestar's wife Kase was one of the vocalists in the song.^[25][20]

In August 2022, Orangestar held his second live titled "UNDEFINED SUMMER-NOISE" in Toyoso PIT in Tokyo.^[26][27] Orangestar himself and his wife Kase hosted the live.^[15]

The username "Orangestar" comes from "未完成" (Japanese word for "incomplete"), which is a homophone of "蜜柑星". "蜜柑" translates to orange in English, while "星" translates to star. Putting these two words together yields "Orangestar".^[7][28]

Orangestar's music heavily features summer: he was born in the summer and loved the summer in Japan.^[4][7][15] Many of his songs included elements from Japan's summer, such as cicadas, though they were composed in the United States. Orangestar claimed that residing in the United States gave him a clearer understanding of the summer in Japan.^[4][26] Besides summer, pianos, stars, seas, melancholy, and loneliness are also recurring themes in Orangestar's lyris.^[4][8]

Orangestar most frequently uses the voicebank IA, as opposed to more popular ones such as Hatsune Miku. He prefers IA because it was the first one he bought and because he likes the sense of transparency in her voice.^[4]

Orangestar usually features simple tones and musical arrangements. He most frequently uses pianos and synthesizers, though guitars sometimes make an appearance in his songs as well.^[13]

Orangestar claims that he subtlely and unintentionally expressed Christian values in his lyrics: these ideas were taught at church and ingrained in him. M.B, his usual illustrator who is also mormon, expressed similar sentiments: the clothing of his characters might be unconsciously Christian as well.^[7]

Orangestar likes anime as a form of expression accompanying his songs.^[7] He has expressed his love of the anime Bakemonogatari and Nagi-Asu: A Lull in the Sea.^[29]

Besides ranking 26th and 45th place on Oricon's weekly sales chart, Orangestar's songs are featured on Billboard Japan's 2022 UGC songs chart, which ranks user-generated songs on YouTube. Both "Henceforth" and "Night Sky Patrol of Tomorrow" reached top 10 in the list, despite the latter song being posted in 2014.^[30]

Orangestar's works have been covered by many artists. For example, "Night Sky Patrol of Tomorrow" was covered by VTuber HIMEHINA in their first cover album and by singer Yuaru in her 5-year anniversary music video.^[31][32] It was also included in mobile rhythm games BanG Dream! Girls Band Party! and Hatsune Miku: Colorful Stage!.^[33][34] These two games have also added Orangestar's "DAYBREAK FRONTLINE" into their list of playable songs.^[35][36]