Isshin Aihara
BIOGRAPHY
Isshin Aihara (Japanese: 相原一心; born 20 December 2005 in Miyagi Prefecture) is a Japanese actor, singer and performer, and a member of the mixed-gender group ONE LOVE ONE HEART. He is with the third division of Stardust Promotion.
He was scouted in 2015, in his fourth year of primary school, and joined Stardust Promotion through its Sendai office rather than the Tokyo one. That regional route shaped his early years: he trained as an EBiDAN research student, performing with EBiDAN SENDAI, and was selected for BATTLE BOYS SENDAI and later for the nationally selected BATTLE BOYS lineup, the company’s route for moving promising regional trainees onto a bigger stage.
He now performs with ONE LOVE ONE HEART, one of the few Japanese groups built with male and female members together rather than as a single-gender idol act.
In 2026 he plays Sora Hanamura in the TOKYO MX Boys’ Love drama Your Sky: Hare Nochi Koi, the Japanese remake of the Thai series Your Sky. Sora is the cold, largely unbothered senior who agrees to pose as Hinata’s boyfriend, and the part asks for stillness rather than charm: the character has to be believable as someone with nothing at stake, for as long as that lasts.
BLGLFlix editorial view
He was signed to a national agency through its regional office, and that decided the shape of his first ten years.
Isshin Aihara, born 20 December 2005 in Miyagi Prefecture, plays Sora Hanamura in Your Sky: Hare Nochi Koi, the Japanese remake of the Thai series. He is with the third division of Stardust Promotion and performs with the group ONE LOVE ONE HEART.
Japanese talent companies run regional branches, and being scouted into the Sendai office rather than the Tokyo one puts a trainee on a slower and more local track: regional trainee units first, then selection into a national lineup if it goes well. He came up through EBiDAN Sendai and BATTLE BOYS Sendai before the national side, which is eleven years of development work before a screen lead.
The group he now performs with has male and female members together, which is uncommon in a country whose idol industry is built almost entirely on single-gender acts.
His part in the series asks for stillness rather than charm, since the character has to read as someone with nothing at stake, and that is a difficult first assignment for a performer trained mainly on stage.
A birth date, prefecture, agency, division, a dated entry into the industry and a working span are all recorded here. No account is listed on this page.
PROFILE DETAILS
- Native Name
- 相原一心
- Pronouns
- he/him
- Born
- (Age 20)
- Birthplace
- Miyagi Prefecture, Japan
- Gender
- Male
- Western Zodiac
- Sagittarius ♐
- Chinese Zodiac
- Rooster 🐓
- Nationality
- Debut
- 2015 — Joined Stardust Promotion in 2015 as an EBiDAN research student in Sendai
- Agency / Label
- Stardust Promotion (third division)
- Years Active
- 2015-present
- Languages
- Japanese (native)
- Skills
- Acting, Singing, Dance
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