[TLG (bowalia)] Chika Tougijou Sen - Underground Colosseum Sen [Chinese] [沒有漢化] [Digital]

[TLG (bowalia)] Chika Tougijou Sen - Underground Colosseum Sen 2 [Digital]

[TLG (bowalia)] Chika Tougijou Sen - Underground Colosseum Sen 3 [Digital]

(CR30) [SOFTCHARM (SOFTCHARM)] FULL-SWEEP EARLY UNDERGROUND (Various)

[TLG (bowalia)] Chika Tougijou Sen - Underground Colosseum Sen [Digital]

[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) [English] [Digital]

[Underground Campaign (Senga Migiri, jin)] Dokata Kuchiman Hole - Tobi Hen

[UNDERGROUND CAMPAIGN (Senga Migiri, Toriki Kuuya)] Ryuuseigou ni Notte Alternative 2

[Unknown] Chika Teien | Underground Garden [English]

[UNDERGROUND CAMPAIGN (Muma, Senga Migiri)] Maison Liberté | Midsummer Daydream [English] [Leon990 Scanlations] [Digital]

(C89) [Yamaneko Jinja (John Inu)] UNDERGROUND ASCENDANCY (Touhou Project)

[Undergroundou] Underground Natural Klutz Orgasm VI

(SPARK8) [Radistar (157)] Triglav Underground Railway (Tales of Xillia)

(C86) [Gekidoku Shoujo (ke-ta)] Underground Blossom (Touhou Project)

(C83) [Tricot (Stella.Ing)] From the Underground (The Legend Of Zelda)

(Underground Carnival) [Kougeki (Ootsuki Wataru)] Speechless (Touhou Project)

[Underground Dou (Stranger)] Jigoku Ezu no Yoru 2

[Underground Dou] NOPOR

[Underground dou] Koushuu Benjo Shounen

(Reitaisai 8) [French letter (Fujisaki Hikari)] Pedolia! underground (Touhou Project)

(C78) [Crazy9 (Ichitaka)] Alice in Underground (Ookami-san to Shichinin no Nakama-tachi) [English] {doujin-moe.us}

(C78) [bolze. (rit.)] The Sunshine Underground (Heart Catch Precure)

(C71) [Kensoh Ogawa (Fukudahda)] Ashford Gakuen Underground (Code Geass) [Decensored]

[C's cheese] ANAN Gango no Miko (Tokyo Underground)

[Red Ribbon Revenger] Valhalla ~Joshou~ (Tokyo Underground & Spiral)

[Nanase Makoto] Chika Ryuushutsu - Leaked to Underground

[Fractal Underground Studio] Himitsu no Basho | Secret Place [English] [SaHa]

(C71) [Kensoh Ogawa (Fukudahda)] Ashford Gakuen Underground (Code Geass)

[Zokubutsu.zip (Asuka)] Zokubutsu.zip (9) Chika | Underground [English] [Digital]

[TLG (bowalia)] Chika Tougijou Sen - Underground Colosseum Sen 5 [Digital]

[TLG (bowalia)] Chika Tougijou Sen - Underground Colosseum Sen 5 [Chinese] [沒有漢化] [Digital]

[TLG (bowalia)] Chika Tougijou Sen - Underground Colosseum Sen 4 [Digital]

[TLG (bowalia)] Chika Tougijou Sen - Underground Colosseum Sen [English] [Sexy Akiba Detectives] [Digital]

[Unknown] Chika Teien | Underground Garden [Chinese]

[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]