1 Month Challenge

Kanako Challenge

Monthly Gekiman Special 2013-06 [Incomplete]

Maki Challenge

[The Monthly Istanbul (Ahugan Sugita)] Kasshoku Oneesan no Fudeoroshi Ver.4.1 [English] [wehasband]

[The Monthly Istanbul (Ahugan Sugita)] Kasshoku Oneesan no Fudeoroshi Ver. 4 [English] [Decensored] [Copy Of] [Digital]

(Dramatic Change 3) [Ne. (Shiromitsu Daiya)] Challenge! Ochinchin Purupuruen ~3-nin nara Dekiru Mo~n~ (THE IDOLM@STER SideM)

(C95) [Andorogynous (Kiyose Kaoru)] Futanari Milk Challenge 5

Kasen-chan no Jasen Rouraku Challenge

[The Monthly Istanbul (Ahugan Sugita)] Bikyaku Zukan (Various) [Digital]

Monthly Vitaman 2009-09

HERE COMES A NEW CHALLENGER!!

(C83) [Super Sentou, The Shakya (Fukutarou, Oke)] Gekkan Otona no RitsuMio Zoukangou | Monthly RitsuMio for Adults - Special Edition (K-On!) [English] [Yuri-ism]

[Nekomata Naomi] Here Comes a New Challenger! (COMIC Kairakuten Beast 2007-04) [English] [Clearly Guilty Translations]

Akane-chan Challenge! 2.5-kaime

(C92) [MeltdoWN COmet (Yukiu Con)] Kanade Challenge Zenpen

[Croriin]~Succubus Challenge~(Isekai Rakuten Vol.5)[Chinese][星瞳漢化]

(C95) [Yamitsuki Honpo (Wise Speak)] JK Tamamo no Shuugaku Ryokou Oppai Challenge (Fate/Extra) [English] [Gawainized]

(C86) [Contamination (eigetu)] Maki Nico Lez Challenge (Love Live!) [Incomplete]

[The Monthly Istanbul (Ahugan Sugita)] Shotagari Witch [Digital]

Something unbelievable happened when I stopped time for 1 month and violated a 42 year old hikikomori woman

(C65) [kodomo challenge (Various)] Shukudai ga Owaranai

[Healthyman] Kokona (Hachikagetsu) | Kokona (Seven months pregnant) (Blue Aka-chan IN-bu) [English] [Team Rabu2] [Decensored] [Digital]

Futanari Milk Challenge 4 | 扶她榨乳挑战 4

Sanae Challenge!!

Futanari Milk Challenge 5 | 扶她榨乳挑战 5

(Utahime Teien 4) ["Tsu" ga Mittsu. (Tsuttsu)] Akane Challenge!? 2 (THE IDOLM@STER CINDERELLA GIRLS) [Chinese] [无毒汉化组]

(C93) [Unagiyasan (Hanamiya Natsuka)] Otona Challenge!! [Chinese] [脸肿汉化组]

Kasshoku Onee-san no Fudeoroshi Yume to Kibou no Bikini Armour

Rika no Oshiri Challenge

[Sakura Garden (Shirosuzu)] Chaldea Outdoor Challenge Abby-chan to Issho 3 (Fate/Grand Order) [Digital]

[Ponkotsu Works] Blind Ecchi! SideA (Monthly Vitaman 2014-09) [Chinese] {G&魔皮卡的女子力研究}

(C94) [ANDOROGYNOUS (Kiyose Kaoru)] Futanari Milk Challenge 4

Monthly 'Aikawa' The Chief Editor Chp. 7

[Story Circle (Seto Kouhei, Siina Yuuki)] TS-kko Otokoyu Challenge! | TS女孩男浴大作战！ [Chinese] [瑞树汉化组]

Semen Storage Challenge

Monthly Vitaman 2013-09

(C94) [Minamono (Minamo)] Ko-Gil Challenge (Fate/Grand Order) [Chinese] [theoldestcat汉化]

Monthly Vitaman 2017-10 [Digital]

[Sen] Makabe no Oshiri Challenge (THE IDOLM@STER MILLION LIVE!)

(SUPER24) [PureSlider (Matsuo)] MONTHLY THE IWATOVISION (Free!)

[Kuon Michiyoshi] HUNDRED GAME Ch. 1 (Monthly Vitaman 2014-10) [English] [allenallenallen333]

Monthly Vitaman 2006-11

[The Monthly Istanbul (Ahugan Sugita)] Kasshoku Oneesan no Fudeoroshi Ver. 3 | Brown Lady Takes His First Time Ver. 3 [English] [vaasi] [Digital]

Sex Challengers

[Taikan Kyohougumi (Azusa Norihee)] Sakura-chan to Oshigoto Challenge - Ona-Hole Challenge with Sakura (Cardcaptor Sakura) [English] [Digital]

Monthly Vitaman 2017-12 [Digital]

(C91) [Molossan (Morochin-san)] DokiDoki Mesuiki! Challenge!! (Various)

[Kijitora Nukodi] Lost - Boku no Kioku ha Kimi no Naka | Lost - My Memory Is Within You (Monthly Vitaman 2015-10) [English] [BabaDeca] [Digital]

[The Monthly Istanbul (Ahugan Sugita)] Kasshoku Oneesan no Fudeoroshi Ver. 3 [Chinese] [cqxl自己汉化] [Digital]

Monthly Vitaman 2014-03

(C78) [WORLD BOX, Bon's (Yuu, Sumeragi Sora)] 2-nen to 8-kagetsu no Kiseki | A Journey of 2 Years and 8 Months (Durarara!!) [English] [ebil_trio]

Takagi Airi no 10-pun Challenge | Takagi Airi's 10 Minute Challenge

[Hara] Misaki-chan no Lotion Challenge

Monthly Vitaman 2014-12

Double Up Challenge!

[Kameyoshi Ichiko] Kanako Challenge (COMIC LO 2020-09) [English] [LoliAce] [Digital]

SKB Challenge

[Kuon Michiyoshi] HUNDRED GAME Ch. 11 (Monthly Vitaman 2015-11) [Chinese] [樱翼汉化组]

Nanjamo to Ura Gym Challenge!! | Iono's Secret Challenge!!

Naisho no Enkou Challenge | Secret Sugar Daddy Challenge

Monthly Vitaman 2014-11

(C86) [Contamination (eigetu)] Maki Nico Lesbian Challenge (Love Live!) [Incomplete]

Gekkan Comic Guts Re: | Monthly Comic Guts Re:

(SC39) [Various (Various)] Hatena? Challenge! (Challenge First-Year-Student)

[ro] Ookami to Akazukin Ch. 2 (Monthly QooPA 2014-09) [Chinese] [E个人汉化] [Digital]

Ko-Gil Challenge

Monthly Vitaman 2018-04 [Digital]

[Karma Tatsuro] Shiawase no Shoujo (Monthly Vitaman 2014-01) [English] [Facedesk]

Iemoto Challenge Series - Jinrui Hasshou no Chi de Mikai no Buzoku to Bunka Kouryuu Isshuukan

(Sennen Battle Phase 10) [ANNIELAURIE (Toyama Nanao)] Sex Challengers (Yu-Gi-Oh! ARC-V)

Teisou Ring Challenge

Honoka Challenge! 2

[Harumi Chihiro] Hoshikuzu Diary (Monthly Vitaman 2007-04) [Chinese]

[ro] Ookami to Akazukin Ch. 2 (Monthly QooPA 2014-09) [Digital]

(C93) [Milk pudding (Jamcy)] Akane-chan Challenge! 2-kaime (VOICEROID) [Chinese] [脸肿汉化组]

(C94) [Minamono (Minamo)] Ko-Gil Challenge (Fate/Grand Order)

Monthly Vitaman 2013-04

Monthly Vitaman 2015-10

[Fujisaka Kuuki] Opparadise wa Shinryouchu | 欧派天国诊疗中 Ch. 8 (Monthly Vitaman 2018-02) [Chinese] [前线作♂战♀基地] [Digital]

Seieki Tamekomi Challenge

[Fanbox] Kanzarin [Hentai of the month] (3648356)

[Jyoka] Igyou Kaikitan Mannequin (Monthly QooPA 2015-06)

Monthly Vitaman 2016-12

I-401 Breeding recording + Monthly social gatherings between male and female submarines

Etorofu-gata Otoile Challenge

CHALLENGE

Monthly 'Aikawa' The Chief Editor Chp. 4

(C94) [Sakura Garden (Shirosuzu)] Chaldea Outdoor Challenge Abby-chan to Issho (Fate/Grand Order) [Chinese] [脸肿汉化组]

Happy Aphrodisiac Challenge

(C88) [Shinobi-Rocket (Sasamashin)] Akatsuki Challenge! (Kantai Collection -KanColle-)

Saimin Appli Challenge!!

Monthly Vitaman 2014-07

Monthly QooPA 2014-11 [Digital]

[d.a.p (mougi)] Unknown Unlock Challenge (CROSS x BEATS) [Chinese] [这很恶堕汉化组] [Digital]

(C93) [ANDOROGYNOUS (Kiyose Kaoru)] Futanari Milk Challenge 2 [English] {Hennojin}

[Torimogura] Osananajimi-chan Ikase Challenge

(C86) [Yamakawa Den'enfuukei (Yamada, Kawada)] HERE COMES A NEW CHALLENGER!! (High Score Girl) [English] [FEPO]

Kids Challenge

A Challenger Has Appeared Which Naturally Leads To A Duel | Chousensha ga Arawareta - Shizen na Nagare de Kettou

Hajimete no Inpio Challenge

[Pyonchi Koubou (Pyonchi)] Dosukebe Muramatsuri 1 - Jigoku no Cli Zeme Mesugaki Taikyuu Renzoku Acme Challenge Hen

Demonic Onsen Paizuri (EscapeFromExpansion)

Monthly MelomELO Mar.2014

At first glance, it looks like a man swimsuit challenge + Textless + Bonus

(C93) [ANDOROGYNOUS (Kiyose Kaoru)] Futanari Milk Challenge 2

Otona Challenge!!