# Death of Japanese idol trainee Runa Hirata

> Live situation record from CLSTR: https://clstr.news/situations/death-of-japanese-idol-trainee-runa-hirata
> Updated: 2026-10-03T17:54:57.000Z. Sources: 24. Developments: 3.

Runa Hirata, an 8-year-old idol trainee with the Nagoya-based DIANNA Project, died in the early hours of September 25 due to myocarditis resulting from an influenza infection.

Her management agency, SISTERMANAGEMENT, and her family confirmed the news on September 28. The sudden passing has shocked fans, as Hirata—known to fans as ‘Luna-chan’—had performed in a public show as recently as September 20, sharing her excitement on social media shortly after the event. Her family noted that approximately one-third of her eight years of life had been dedicated to idol activities. In a social media tribute, her family requested that she be remembered as an idol, noting that music was central to her life.

Following the family’s wishes, the funeral and wake were held privately with only close relatives and acquaintances in attendance. The agency has expressed deep sorrow and requested privacy for the family during this time. Her followers, whom she affectionately referred to as ‘gozarumas’, have expressed significant mourning.

Following her death, medical experts highlighted that while influenza is typically recoverable, it can cause severe complications such as myocarditis, encephalitis, and pneumonia. Professionals emphasized that administering antiviral treatments within 48 hours of symptom onset is critical to mitigating these risks.

## Timeline

### 2026-10-03: Hirata Runa, 8-year-old J-pop idol trainee, dies from myocarditis

Eight-year-old J-pop idol trainee Hirata Runa has died from myocarditis caused by influenza, just days after her final performance with the DIANNA Project in Nagoya, Japan.

15 sources. https://clstr.news/cluster/hirata-runa-j-pop-trainees-death-confirmed-as-myocarditis

### 2026-09-29: Japanese idol trainee dies from influenza-related myocarditis

An 8-year-old Japanese idol trainee died from myocarditis caused by influenza. Separately, singer Lee Seung-chul celebrated his 40th musical anniversary in Seoul with artist Woodz.

2 sources. https://clstr.news/cluster/japanese-idol-trainee-dies-from-influenza-related-myocarditis

### 2026-09-28: Hirata Runa, 8-year-old Japanese idol trainee, dies from influenza complications

Eight-year-old Japanese idol trainee Hirata Runa has died from myocarditis caused by influenza, just five days after her last public performance with the DIANNA Project.

7 sources. https://clstr.news/cluster/runa-hirata-8-year-old-idol-trainee-dies-from-myocarditis

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Cite as: Death of Japanese idol trainee Runa Hirata. CLSTR, https://clstr.news/situations/death-of-japanese-idol-trainee-runa-hirata