Kousei Nishiyama
西山晃世
Musician
__[Twitter](https://twitter.com/koseimusic) | [Instagram](https://www.instagram.com/koseij45/)__ __Kousei Nishiyama__, stylized as Kosei Nishiyama, alternatively known as Kosei, is a Japanese vocalist, lyricist, multi-instrumentalist and member of the acoustic session group PLUSONICA.
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