(C65) [kodomo challenge (Various)] Shukudai ga Owaranai
(SC40) [Delayder (Makinon TM)] Yousei-san no?! Himitsu no Bouken no Tobira Preview ver (Challenge First-Year-Student)
(C94) [Moruda Ramenya (Moruda)] Okei-san no Nukinuki Dosukebe Challenge | Okay-san's Dirty Lewd Challenge (Girls und Panzer) [English] {Doujins.com}
(SC39) [Various (Various)] Hatena? Challenge! (Challenge First-Year-Student)
[Mikeke] Hatena Manga - Semete Yacchae! (Challenge First-Year-Student)
(SC39) [Nounai Kanojo, Ningen Modoki, Tateyoko Hotchkiss, Kagi Node (various)] Hatena? Challenge! (Challenge First-Year-Student)
(C64) [kodomo challenge (Various)] natsu no kansatsu nikki | Summer observation diary (Original) [English]
(C63) [Kodomo Challenge (various)] Mainiti-ga-Kodomo-no-hi
(C64) [kodomo challenge (Various)] Natsu no Kansatsu Nikki
