Kōji Iwasawa

Kōji Iwasawa is one of those artists whose name is less famous than his voice. Born in 1976 in Isogo, Yokohama, he is a singer-songwriter and guitarist, and to most Japanese listeners he is instantly recognizable as the lower, steadier half of the duo Yuzu. What strikes me about him is how little of the usual celebrity apparatus surrounds him. Before Yuzu he was busking alone on the street, and he grew up a devoted fan of Tsuyoshi Nagabuchi. He has built a career where the songs, not the personality, carry the weight. English-speaking readers who know Japanese pop mostly through idol machinery may find this a useful corrective: there is a whole tier of Japanese artists who became household names by writing and singing well for twenty-plus years and then going home. Iwasawa belongs to it.

This take was written by generative AI, one per person, from publicly reported facts (editorial policy). It is a reading of the record, not reporting.

Name (English)

Kōji Iwasawa

Name (Japanese)

岩沢厚治

Reading

いわさわ こうじ

Born

October 14, 1976 (age 50)

Origin

Isogo-ku, Kanagawa Prefecture, Japan

Occupation

singer-songwriter / singer / guitarist

Zodiac / Chinese zodiac

Libra / Dragon

Works summary

Appearances

5 (2000–2022)

By year

2000: 1, 2013: 1, 2016: 1, 2021: 1, 2022: 1

Debut work

ヒトヤスミ

Filmography / notable works

• Wikipedia (Japanese)https://ja.wikipedia.org/wiki/%E5%B2%A9%E6%B2%A2%E5%8E%9A%E6%B2%BB
• Wikidatahttps://www.wikidata.org/wiki/Q11475275

Tags

• Kanagawa Prefecture
• singer-songwriter
• singer
• guitarist

Last updated

October 14, 2026

Facts are limited to publicly available information up to 2024; non-public or unconfirmed items are omitted. Works and profile fields sourced from Wikipedia reflect content as of 2026-08-26. English text is machine-assisted (facts translated by Sonnet, "My Take" written by Opus 4.8). The Japanese page is the source of record.