[Shiruka Bakaudon] Uramono Zasshi No Fan Wa Yahari Orokamono De Aru | Fans of Underground Magazines are Truly Fools (COMIC Mate Legend Vol. 15 2017-05)[Chinese] [沒有漢化]
[Shimaji] Mushaburi Learning | Let's Study Penis (COMIC Shitsurakuten 2013-05) [English] [CGrascal]
Underground Hotel Vol. 1
(C99) [Kurohamya (Kurosu)] Satonaka Chie-chan ni Oshioki suru Hon Test Benkyou Hen | Satonaka Chie's Punishment - Test Study Edition (Persona 4) [English] [head empty]
Yuki Chinpo - Futanari Yukiho ga Hibiki o Otosu Hon
(C72) [Kirimochi Texture (Yoyoyoyou)] Hentai Ichidou Ground e Shuugou!! (Mitsudomoe)
[Miura Takehiro] BUST UP SCHOOL -Yawaraka Kigougun- | -Soft Code Group- ch. 1-5 [English] {Brolen}
[Shinkirou Akatsuki (Itten Chiroku)] Dememan (Haunting Ground)
Secret Study Session
[PURUpyon Saitou] Otona no Benkyou | Adult Studies (Midara na Haha Shishunki na Boku) [English] [sirC]
[TLG (bowalia)] Chika Tougijou Sen - Underground Colosseum Sen 2 [Chinese] [沒有漢化] [Digital]
[Husky guy] SStudy Ch.0-36 (English) (YoManga) (Ongoing)
After School Studies
[Nanase Makoto] Chika Ryuushutsu - Leaked to Underground
[UNDERGROUND CAMPAIGN (Senga Migiri, Toriki Kuuya)] Ryuuseigou ni Notte Alternative 2
(COMIC1☆10) [Flicker10 (Kuronyan)] Issho ni Obenkyou... Shiyokka? | Would You Like to... Study Together? (Strike Witches) [English]
(C93) [CRIMSON GROUND (Miyashiro Sousuke)] Torofuwa Mashumaro (Fate/Grand Order) [Chinese] [花火汉化组]
[Yanagi Masashi] Kawai onna to yobaretai
ANTIMORAL
Underground Hotel ~Cross Over~
Underground Six
Let's Study!
Group Home Mazo
SStudy Ch.0-25
[Group 601] ningyou no chinutsu (Rozen Maiden)
(C93) [CRIMSON GROUND (Miyashiro Sousuke)] Torofuwa Mashumaro (Fate/Grand Order)
(C92) [CRIMSON GROUND (Miyashiro Sousuke)] Scathach Shishou to Celt Shiki Gachihamex! (Fate/Grand Order)
[PNO Group (Hase Yuu)] Motto! Ilya Bunhokan Keikaku (Fate/stay night)
Sakura-Chan's Free Study 2
(C95) [Ukatsu de wa Nai (noukatu, Minase Kuru)] Vtuber Sokuhame Kairaku Ochi Bon (Tsukino Mito, Deep Web Underground, Shizuka Rin) [Chinese] [homolive汉化组]
Imouto Sengen
[Seto Yuuki] Stretta Ch. 2 | I Can't Study (Side B) [English] [RyuuTama] [Decensored]
Takonyuu~ | Squid Tits~
Hitsugi
(C94) [A.S.G Group (Misonou)] Zoku Yamaoku e Ikou! (Dragon Quest V)
(Reitaisai 15) [Arutana (Chipa)] Kokoro Onee-chan to H na Obenkyou | Study-Time with Kokoro Onee-chan (Touhou Project) [English] [Mister lol]
[Pipo] A Study on the Boundaries of Cheating
(C93) [A.S.G Group (Misonou)] Youmagun Ou Kakka no Dosukebe Dealer | King Youmagun's Remarkable Dealer (Dragon Quest XI) [English] [Doujins.com]