(C90) [KINOKONOMI (konomi)] Nyancology 5 -Usami-san to Himitsu no Misshitsu- | Nyancology 5 -Usami-san And The Secret Room- [English] {Doujins.com}

(C85) [KINOKONOMI (konomi)] Nyancology 2 -Nekota-san to Himitsu no Asa Jijou- | Nyancology 2 -Nekota-san's Secret Morning Affairs- [English] [Doujins.com]

(Mimiket 28) [KINOKONOMI (konomi)] Nyancology -Kaettekita Nekota-san no Himitsu- | Nyancology -Homecoming Nekota-san's Secret- [English] [Doujins.com]

(CSP6) [KINOKONOMI (konomi)] Nyancology 4 -Usami-san To Himitsu no Hokenshitsu- | Nyancology 4 -Usami-san And The Secret School Infirmary [English] {Doujins.com}

[A.O.I (Dot-R)] Koko ni Hitori Damasareta Imouto ga Iru. (Kono Naka ni Hitori, Imouto ga Iru!) [Digital]

[Tokutan Biyori] Konoe ga Sonna Koto o! (Kono Naka ni Hitori, Imouto ga Iru!)

[RACK&PINION (Iogi Juichi)] Konoe ADVENTURE (Kono Naka ni Hitori, Imouto ga Iru!) [Digital]

(Mimiket 28) [KINOKONOMI (konomi)] Nyancology -Kaettekita Nekota-san no Himitsu- | Nyancology - Homecoming Nekota-san's Secret [English] {Doujins.com}

Kono Aozora ni Yakusoku official artbook

(COMIC1☆11) [KINOKONOMI (konomi)] Nyancology 6 -Nureta Nekoda-san no Himitsu- | Nyancology 6 -Nekoda-san's Wet Secret- [English] {Doujins.com}