Koji Endo, the Japanese composer who scored the MBS BL series Hold on, Harutora-kun

Koji Endo

BIOGRAPHY

Koji Endo (遠藤浩二, born 1964 in Yonago, Tottori Prefecture) is a Japanese composer and arranger, and one of the most heavily worked film composers in Japan. TMDB credits him on 285 productions spanning 1992 to 2026. He runs his own Tokyo studio, SoundKids, and works as the head of SOUND KID’S.

He is best known as Takashi Miike’s composer, a partnership that began with Rainy Dog (極道黒社会) in 1997 and ran through much of the director’s most internationally visible work, including Audition (1999), Dead or Alive (1999), Visitor Q (2001), The Happiness of the Katakuris (2001), Gozu (2003), Zebraman (2004), Izo (2004), One Missed Call (2004) and Sukiyaki Western Django (2007). Away from Miike his credits run from the Ju-on-adjacent horror boom of the 2000s to television, live-action manga adaptations and children’s tokusatsu, and they have not slowed: he has TMDB-recorded credits in every year of the 2020s, including four dated 2026.

One of those 2026 credits is Hold on, Harutora-kun, the MBS Boys’ Love series, for which he wrote the score. The music credit is confirmed on MBS’s own programme site.

BLGLFlix editorial view

It is worth stopping on what this credit actually is. Boys’ Love series are, with rare exceptions, made cheaply and quickly, and their music is usually written by people at the start of their careers or bought in as library cues. Hold on, Harutora-kun hired a composer with three decades and nearly three hundred productions behind him, including the scores to some of the most widely seen Japanese films of the last thirty years. Whatever else that says about the series, it is a real production decision, and it is the sort of thing a cast-indexed database never surfaces, because composers do not appear on cast lists.

It also tells you something about how Japanese BL is being made now. Japan came to the format late relative to Thailand and Korea, and it has been catching up by putting it inside the ordinary television production system rather than building a separate low-cost pipeline for it. A veteran MBS composer on a BL is what that looks like from the credits.

On the scale: 285 credits is not a figure to quote lightly. It is TMDB’s count of every crew entry attached to him, so it includes multi-part television and some duplication. Even discounted heavily it describes a working life of continuous scoring across thirty-four years.

One detail worth keeping. According to his Japanese Wikipedia entry he has competed since 2009 in races sanctioned by the Japan Automobile Federation as an amateur driver, and in 2015 he won the annual Clubman-series championship in the 86/BRZ Race. A man who has scored several hundred films spends his weekends racing cars, and won something doing it. It is included because it is verifiable and because a reference site that only ever prints filmographies produces pages nobody wants to read.

One data note. TMDB gives his date of birth as 1 January 1964 and Wikidata’s entry, Q2947344, records the same year at a precision of nine, meaning year only. The first of January is a storage artefact in both cases, not a birthday. This page publishes the year in prose and leaves the date field empty.

PROFILE DETAILS

Native Name
遠藤浩二
Real Name
Koji Endo
Pronouns
he/him
Birthplace
Yonago, Tottori Prefecture, Japan
Gender
Male
Profession
Nationality
Agency / Label
SOUND KID'S
Years Active
1992-present
Languages
Japanese

FILMOGRAPHY — TV SERIES (1)

TRIVIA

He is an amateur racing driver. His Japanese Wikipedia entry records that he has competed in Japan Automobile Federation-sanctioned races since 2009, and that he took the Clubman series annual championship in the 86/BRZ Race in 2015.

TMDB credits him on 285 productions across thirty-four years, from 1992 to 2026, with entries in every year of the 2020s.

His partnership with Takashi Miike began in 1997 with Rainy Dog and covers most of the director’s best-known international work.

He runs his own studio, SoundKids, in Tokyo, and is the head of the company SOUND KID’S.

He is from Yonago in Tottori Prefecture, one of the least populous prefectures in Japan.

Hiring him for a Boys’ Love series is unusual. BL scores are typically written by newcomers or assembled from library music, and Hold on, Harutora-kun went to a composer with three decades of feature credits.

His Wikidata item, Q2947344, has articles in Japanese, German, French and Italian, and none in English. For a composer this widely credited, that is a striking gap in the English-language record.

Neither TMDB nor Wikidata records a day or month for his birth. Both hold 1964 only, and the 1 January that appears in the data is a placeholder.

FREQUENTLY ASKED QUESTIONS

Who is Koji Endo?

Koji Endo (遠藤浩二) is a Japanese composer and arranger born in 1964 in Yonago, Tottori Prefecture. TMDB credits him on 285 productions between 1992 and 2026. He wrote the score for the 2026 MBS Boys’ Love series Hold on, Harutora-kun.

What is Koji Endo best known for?

Being Takashi Miike’s composer. The partnership began with Rainy Dog in 1997 and covers Audition, Dead or Alive, Visitor Q, The Happiness of the Katakuris, Gozu, Zebraman, Izo, One Missed Call and Sukiyaki Western Django, among many others.

Did Koji Endo write the music for Hold on, Harutora-kun?

Yes. The music credit is confirmed on MBS’s own programme site for the series, and the Japanese Wikipedia staff list agrees.

How many credits does Koji Endo have?

TMDB records 285 crew credits spanning 1992 to 2026, including four dated 2026. That count includes multi-part television and some duplication, so it should be read as a measure of scale rather than a precise number of works.

Where was Koji Endo born?

Yonago, in Tottori Prefecture, according to his Japanese Wikipedia entry.

Is Koji Endo a racing driver?

As an amateur, yes. His Japanese Wikipedia entry records that he has competed in races sanctioned by the Japan Automobile Federation since 2009, and that he won the Clubman series annual championship in the 86/BRZ Race in 2015.

Why does this page show only a birth year?

Because that is all the record supports. TMDB gives 1 January 1964 and Wikidata records 1964 at year-only precision, so the first of January is a storage artefact rather than a birthday. The year appears in the text and the date field is left empty.

What is SOUND KID'S?

Koji Endo’s own company. He works from his Tokyo studio, SoundKids, and is credited as head of SOUND KID’S.

Does Koji Endo have social media?

No accounts are recorded for him by TMDB or any source this site accepts, so none is published here.

Biographical details and any photograph on this page come from TMDB and the sources named in our editorial notes. This product uses the TMDB API but is not endorsed or certified by TMDB. BLGLFLIX is an independent reference site with no affiliation to the person profiled or their agency, and does not publish speculation about anyone’s private life. Full copyright, correction and takedown policy: Disclaimer.

Sources

5 sources

Every factual claim on this page is taken from the records below. Where two sources disagree, the disagreement is stated in the text rather than resolved silently.

  1. TMDBTMDB person record (Koji Endo, id 35633), for the biography, the Miike partnership, the credit count and the profile photograph themoviedb.org/person/35633
  2. MBSMBS - official programme site for Hold on, Harutora-kun, for the music credit mbs.jp/harutora
  3. WikipediaJapanese Wikipedia - 遠藤浩二, for the birthplace, the filmography and the amateur racing record ja.wikipedia.org/wiki/%E9%81%A0%E8%97%A4%E6%B5%A9...
  4. WikidataWikidata Q2947344, for the year-only birth precision wikidata.org/wiki/Q2947344
  5. IMDbIMDb name page nm0256862 imdb.com/name/nm0256862

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