wiki:
Treasure Hunter (肥前屋兵衛 Uchū Jūbe, serialized in Shōnen Champion, 1994–1995)
Alien Nine (エイリアン9, serialized in Young Champion, 1998–1999)
Milk Closet (ミルククローゼット, serialized in Afternoon, 2000–2001)
Propeller Heaven (プロペラ天国 Propeller Tengoku, serialized in Ultra Jump, 2000–2001)
Alien Nine Emulators (エイリアン9 エミュレイターズ, serialized in Champion Red, 2002)
Radio Depart (ラジオデパート, one-shot in Afternoon Season Zōkan, 2002)
Battle Royale II: Blitz Royale (BR2/ブリッツ・ロワイアル, serialized in Young Champion, 2003–2004, based on Koushun Takami)
Tokumu Hōkōkan Yumihari (特務咆哮艦ユミハリ, serialized in Genzo, 2004–2007)
Yume Nikki (ゆめにっき, serialized in Manga Life Win, 2013–2014)
Alien 9 Next (エイリアン9ネクスト, self-published, 2015–2016)