Ogon no Hai (黄金の灰?), 2001 (The Golden Ash)
Gansaku "Botchan" Satsujin Jiken (贋作『坊っちゃん』殺人事件?), 2001 (A "Botchan" Parody Murder Mystery)
Shunposhion: Sokuratesu Saigo no Jiken (饗宴 ソクラテス最後の事件?), 2001 (Symposium: The Last Case of Socrates)
Hajimari no Shima (はじまりの島?), 2002 (The First Island)
Shinsekai (新世界?), 2003 (New World)
Zabieru no Kubi (ザビエルの首?), 2004 (Xavier's Head)
Wagahai wa Sharokku Homuzu de aru (吾輩はシャーロック・ホームズである?), 2005 (I am Sherlock Holmes)
Tokyo Purizun (トーキョー・プリズン?), 2006 (Tokyo Prizon)
Tora to Tsuki (虎と月?), 2009 (Tiger and the Moon)
Kingu ando Kuin (キング&クイーン?), 2010 (Kind and Queen)
Saisho no Tetsugakusha (最初の哲学者?), 2010 (The First Philosopher)
Romansu (ロマンス?), 2011 (Romance)
Rakuen no Cho (楽園の蝶?), 2013 (Butterfly in Paradise)
Naito ando Shadou (ナイト&シャドウ?), 2014 (Knight and Shadow)
Sokuratesu no Tsuma (ソクラテスの妻?), 2014 (The Wife of Socrates)
Short story collections
Parutenon (パルテノン?), 2004 (Parthenon)
Shiton Tantei Dobutsuki (シートン(探偵)動物記?), 2006 (Detective Seton Animal Chronicles)
Hyakuman no Maruko (百万のマルコ?), 2007 (Marco The Million)
Soseki Sensei no Jikenbo: Neko no Maki (漱石先生の事件簿 猫の巻?), 2007 (The Case-Book of Soseki)
Kaidan (怪談?), 2011 (Kaidan)