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Seikin

2026-05-14

What happened to Seikin today?

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Who is this?

Seiya Kaihatsu (Japanese: 開發聖也, Hepburn: Kaihatsu Seiya; born July 30, 1987) professionally known as Seikin (Japanese: セイキン), is a Japanese YouTuber and singer-songwriter. His younger brother is YouTuber Hikakin, who is also a member of the Japanese music group Hikakin & Seikin.