- Name: Yoichi Hayashi (林 陽一)
- Web Site: http://insomnia.selfip.com/index.html
Yoichi Hayashi (born March 28th, 1967) was the main sound director for several early CS pop'n music games, including ANIMELO and DISNEY TUNES up to pop'n music 9 CS. He joined Konami on October 1996, and was in change of the music programming of games like Tokimeki Memorial ~Oshiete Your Heart~ (ときめきメモリアル〜教えてYourHeart〜) and Jikkyou Powerful Pro Baseball S (実況パワフルプロ野球S).
Yoichi moved to Konami's Shanghai branch on April 2004, until August 2007, when he left Konami.
- Haya-P (primary alias)
- Color Essence
- ミッキー・マサシ (singing alias)