(C64) [Shinkouzan Tozantai (Kogawa Yasushi)] Happa Tai 1 (ToHeart, Kizuato, and Magical Antique)
(C63) [Shinkouzan Tozantai (Kogawa Yasushi)] Happa Tai 2 (ToHeart, Kizuato, and Magical Antique)
(C80) [Kouzaka-san, Makino Jimusho] SISTERS - Kakusareta Kioku, Natsu no Owaranai Hi (SISTERS -Natsu no Saigo no Hi-) [English] {doujin-moe.us, Fuwafuwaru}
(C84) [Kouzaka-san to Makino Jimusho] SISTERS -Natsu no Haruka no Hi- + Extra Book (SISTERS -Natsu no Saigo no Hi-)
(C80) [Kouzaka-san to Makino Jimusho] SISTERS -Natsu no Owaranai Hi- (SISTERS -Natsu no Saigo no Hi-)
(C83) [Kouzaka-san to Makino Jimusho (Kouzaka Kouhei)] SISTERS ～Natsu no Gensou no Hi ～ (Sisters ~Natsu no Saigo no Hi~)
(C64) [Studio Koron (Kouzaka Kohei)] GENESIC SAGA-another story.04- (The King of Braves GaoGaiGar)
(C83) [Kouzaka-san to Makino Jimusho (Kouzaka Kouhei, Taki Minashika)] SISTERS -Natsu no Saigo no Hi- ART WORK (SISTERS -Natsu no Saigo no Hi-)
(C66) [Shinkouzan Tozantai (Kogawa Yasushi)] Happa Tai 2 Revised Edition (ToHeart, Kizuato, and Magical Antique)
(C92) [Shinkouzan Tozantai (Kogawa Yasushi)] Anoko no Mune wa Horizon (Log Horizon)
