Mazu Ippō Popular Press Yori ["First, A Letter From Popular Palace"] (Tokyo: Shūeisha, 1996, 1998) [published in two volumes: conclusion never republished in book form after its first magazine appearance (1998 Jump Novel): pb/Hiroyuki Kawashima]
Kochira Yūseishō Tokuhaika ["This is the Postal Ministry Special Dividend Section"] (Tokyo: Asahi Sonorama, 1999, 2001) [published in two volumes: pb/Taku Koide]
Icarus no Tanjōbi ["Birthday of Icarus"] (Tokyo: Asahi Sonorama, 2000) [pb/Kaito Ōmoto]
Tsuishin: Kochira Tokubetsu Haidatsuka ["PS: This is the Special Delivery Section"] (Tokyo: Asahi Sonorama, 2001) [published in two volumes: pb/Taku Koide]
Kokohore One-One (Tokyo: Shūeisha, 2001, 2002) [published in two volumes: pb/Akitsugu Takagi]
Hitsuji to Saru to Hyakukiku no Ginga ["A Galaxy of Sheep and Monkeys and Many Small Quantities"] (Tokyo: Hayakawa Bunko, 2011) [Tenmei no Shirube: pb/]
Shukuen ["Tavern Grudge"] (Tokyo: Hayakawa Bunko, 2012) [published in two volumes: Tenmei no Shirube: pb/]
Shinsekai Herb C ["New World Herb C"] (Tokyo: Hayakawa Bunko, 2013) [Tenmei no Shirube: pb/]
Hito de aru Hito to nai Hito to ["With a Person Who Both Is and Isn't a Person"] (Tokyo: Hayakawa Bunko, 2015-2016) [published in two volumes: Tenmei no Shirube: pb/]
Aoba yo, Yutakanare ["Green Leaves, Get Rich"] (Tokyo: Hayakawa Bunko, 2018-2019) [published in three volumes: Tenmei no Shirube: pb/]