Original: On July 19, 2000, he formed (with fellow anison vocalists Hironobu Kageyama, Masaaki Endoh, Eizo Sakamoto, and Rica Matsumoto) the "supergroup" JAM Project.
Simplified: On July 19, 2000, he joined as a part-time member of the supergroup JAM Project with other members - Hironobu Kageyama, Masaaki Endoh, Eizo Sakamoto, and Rica Matsumoto.