Kyouko and Her Beloved Idiot
[TTSY] Otonari-san no Naisho na Enkou Seikatsu
(C91) [Fujiya (Nectar)] Naisho na Shinomiya-san | The Secretive Shinomiya-san [English] {Hennojin}
Boku to Oneesan no Naisho
(C88) [Gadget (Chobariki Mitsuo)] Naisho no Beit no Susume (Yama no Susume)
[Oozora Kaiko] Papa ni wa Naisho no Boshi no Fureai
Papa ni wa naisho! | It's a Secret From Daddy!
[Torajima-shi Kouhouka (Torajimaneko)] Builder to Fighter no Naisho Banashi (Gundam Build Fighters) [English] {Shotachan} [Digital]
Omote to Ura no Himitsu to Naisho
(C82) [Tonzura Douchuu (Kazawa)] Kyouko no hibi (Touhou Project) [Chinese] [CE家族社]
Kareshi ni Naisho de2 Nama Rankou...Shichaimashita.
Isekai Tensei Shita Saki de Party Member Zenin to Naisho de Ecchi Shiteru Neet
[Human High-Light Film (Nise Tsuruta Hirohisa)] Honey no Naisho 2 (Cutey Honey)
(C90) [Kaminari-neko (Eitarou)] Miho to Anzu no Naisho no Himegoto (Girls und Panzer)
Kareshi ni Naisho de AV... Dechaimashita.
[Vitamin Gohan (Hasegawa Keita)] Naisho no Sakuya-san (Touhou Project) [Digital]
(COMIC1☆5) [Shimoyakedou (Ouma Tokiichi)] Naisho no Mahou (Puella Magi Madoka Magica)
Ran, shin ichi ni naisho de AV shutsuen suru
(SPARK8) [Yu-cho (Pal)] Otona niwa Naisho (Free!)
Honey no Naisho 3
(C88) [Mama ni wa Naisho (Plasma Beach)] Chan nana no Shokutaku (GOD EATER)
(C94) [Bitimaru (bitibiti)] Kyouko to Are Suru Hon 3 (Puella Magi Madoka Magica) [Chinese] [脸肿汉化组]
Naisho no Kojin Shidou 2
Ikenai Koto wa Naisho de Suru Mono
Naisho na Shinomiya-san
[Garakuta Shoujo (Miito Shido)] Kanojo wa Chou Yuumei Geinoujin... Soshite Boku ni Naisho de AV Joyuu Satomi-Satona Gojitsudan 1
Jiiji ni wa Naisho ni Shite ne
(Bokura no Love Live! 17) [Doku Tonkotsu Niku Dorei (Tanohito)] Chika-chan ni mo Naisho no Himitsu (Love Live! Sunshine!!)
(C81) [Mama ni wa Naisho (Purukogi Beach)] Fukkin! (King of Fighters)
(Kouroumu 6) [04U (Misasagi Task)] Anoko nya Naisho (Touhou Project) [English] [KageSennin]
Chika-chan ni mo Naisho no Himitsu 3
(C81) [Okina Keikaku (Shiwasu no Okina)] Daasan no Tame ni Okita Kyouko 32sai B107 a.k.a Okusan wo Namadashi Nikuana Choukyou Shiteoite Ageyou (Okusan) [English]
A Book Where Sayaka-chan and Kyouko-chan Just Have Sex.
(Puniket 12) [Soul Magic (Sudoo Kaoru)] Suki suki Aiko-chan Mayonaka no naisho (Ojamajo Doremi)
Naisho no Kojin Shidou Shinkyuu Hen
[Katuraya (Takemaru)] Naisho no Ichiban Kuji (Mahou Shoujo Lyrical Nanoha)
(COMIC1☆8) [TriaL3 (Various)] Naisho no Imouto Ecchi
Houkago no Naisho
(C85) [Yadokani Daikaiten (Kawamoto Yutsuki)] Naisho no Ecchi (Ro-Kyu-Bu!)
[Hitori Jozu (Hitori Jozu)] Kyouko-chan to Iku Ippaku Futsuka Onsen Ryokou (Puella Magi Madoka Magica) [Digital]
[Tamagoro] Boku to Oneesan no Naisho (COMIC Penguin Club Sanzokuban 2014-07) [English] [vaasi]
[Ponsuke] Naisho no Kaihou (COMIC LO 2017-12) [Chinese] [腥海社] [Digital]
Suyasuya Kyouko-chan o Osawari Kansatsu
(Reitaisai 14) [Rocket Chousashitsu (Koza)] Kazami Yuuka to Naisho Play (Touhou Project)
[Nedaore (Ayane)] Onnanoko Naisho Space (Puella Magi Madoka Magica) [Digital]
(COMIC1☆9) [Atelier Lunette (Mikuni Atsuko)] Naisho Nano! -Haruhara-ke Sanshimai Monogatari- | It's a Secret! 2 [English]
[Shouji Ayumu] Naisho desu yo | It's a secret! (Chiccha-na Onaka) [English] [Rin]
[kedamono (Tori Hrami)] Naisho no Undoukai | 运动日的秘密 [Chinese] [本子社汉化] [Colorized] [Digital]
(COMIC1☆9) [Shiratamaco (Shiratama)] Naisho no Passion - The Secret Passion (Pripara)
(C93) [Bitimaru (bitibiti)] Kyouko to Are Suru Hon 2 (Puella Magi Madoka Magica)
Kareshi ni Naisho de 2 Nama Rankou...Shichaimashita. | Keep This A Secret From My Boyfriend 2 - I Had... Raw Group Sex
[Titokara 2nd Branch (Manami Tatsuya)] Naisho no Kimochi Bangai Hen (Zero no Tsukaima)
(CSP5) [popular plus (Plus)] Boku to Hideyoshi to Naisho no Yorimichi (Baka to Test to Shoukanjuu)
(C90) [Brilliant Thunder (Yumeno Tanuki)] Oya ni Naisho no Umi no Iedex
[Kawamura Tsukasa] Naisho ni Shitai Juu no Monogatari [Digital]
(C79) [Otafukutei (Okamoto Fujio)] Kyouko no Kokan (PlaWres Sanshirou)
(C79) [Human High-light Film (Shiosaba)] Naisho no Ayanami (Neon Genesis Evangelion)
Nanao no Naisho
[Kitsuneya (Leafy)] Chibikko Eirei to Naisho no Okusuri Techou - Young lady hero secret medicine notebook (Fate/Grand Order) [Digital]
Kyouko to Sayaka no Ichaicha Biyori 1-6