Kinjo no Chuugakusei no Otokonoko ga Watashi no Mune o Chirachira Mite kuru node... Sex o Shite ageta Hanashi.
Young Champion Retsu Vol.12 (2008-05-25 Zoukangou)
[Takatsu] Hitozuma A-san to Musuko no Yuujin N-kun - Married wife A and son's friend N-kun [Chinese] [罗洁爱儿个人汉化]
Manga Bon 2012-06
Onegai Anna Sensei by Seiji Matsuyama
Young Champion Retsu Vol.10 (2008-01-25 Zoukangou)
(C85) [Matsuyama Seiji (Matsuyama Seiji)] Eiken Makaizou (Eiken) [Incomplete]
Gender Bender Into Sexy Medical Examination! You said that you were only going to look... 3
Nyotaika de Ecchi Kenshin!? Mirudake tte Itta no ni... 1 | Gender Bender Into Sexy Medical Examination! You said that you were only going to look... 1
[EX35 (Kamaboko RED)] Genki ga Areba Nandemo Dekiru! (Bakusou Kyoudai Let's and Go!!)
[Maguro Usagi (Suparu)] HYBRID STAR (Guilty Gear)
[Matsuyama Seiji] Otona no Eiken Kirika ~Chibukuro yori Ai o Komete~ | Eiken Adult Kirika ~With Love From the Milk Bags~ (Eiken) [English] [Digital]
(C81) [BOBCATERS (Hamon Ai, Matsuyama Seiji)] Yukiho Shinken (THE iDOLM@STER) [English] [Tigoris Translates]
Part no Misako-san Mune o Chirami Shite Kuru Shinjin-kun ni Fudeoroshi Shite Ageru no Ga o Suki
[Matsuyama Seiji] Otona no Zokusei Late2015 [Digital]
Yarashite Kureru Gal Onee-chan.
Young Champion Retsu Vol.06
Otona no Eiken ~Shinonome Chiharu 26-sai~
[shirando] 東海地域限定的 拉麺屋看板娘
Young Comic 2008-10
[Matsuyama Seiji] Otona no Eiken Kirika ~Chibukuro yori Ai o Komete~ (Eiken) [Digital]
Hajimete no Furin Onsen
Nyotaika de Ecchi Kenshin!? Mirudake tte Itta no ni... 4 | Gender Bender Into Sexy Medical Examination! You said that you were only going to look... 4
Young Champion Retsu Vol.05
[anthology] Breath Special Tokushuu Loli-Shota
[杯面] 堕.续 [中國語]
[Matsuyama Seiji] Eiken Makaizou (Eiken) [Digital]
Young Comic 2008-07
Young Comic 2009-07
[Matsuyama Seiji] Misoji Idol Takahashi Reiko-san no Yawarakai Oppai de Kyousha (THE IDOLM@STER CINDERELLA GIRLS) [Digital]
[Matsuyama Hayate] Nyotaika de Ecchi Kenshin!? Mirudake tte Itta no ni... 6 [Digital]
[Matsuyama Seiji] Eiken Rensai Kaishi 10-shuunen Kinen Bon Kaiteiban Sai (Eiken) [Digital]
Yarashite Kureru Yankee no Mama
[Matsuyama Seiji] Eiken Makaizou 2 (Eiken) [Digital]
[ピロシキ帝国(ンモ=エザゴ)] 生徒会長が食っちゃ寝を繰り返したら牛になったって本当ですか!?(白猫プロジェクト)
Eiken Rare Illust-shuu
[Matsuyama Seiji] Eiken Makaizou (Eiken) [English] [Mongolfier] [Digital] [Incomplete]
Young Comic 2009-01
(C86) [Okatoraya (Okatora)] Kogaremasuwa Shidou-san (Date A Live) [Chinese] [瑞树汉化组]
Young Champion Retsu Vol.03
[Matsuyama Seiji (Matsuyama Seiji)] Part no Misako-san Mune o Chirami Shite Kuru Shinjin-kun ni Fudeoroshi Shite Ageru no Ga o Suki
Bitan Bitan
(C72) [IIWAKE-GAISYA (Shigemiya Kyouhei)] Yukari Naburi (Persona 3)
[Matsuyama Hayate] Nyotaika de Ecchi Kenshin!? Mirudake tte Itta no ni... 1 [Digital]
[Matsuyama Seiji] 50-sai no Haha ga Erosugite Nakadashi Sex o Shite moratta Doutei no Boku [Digital]
Tanomu to Sex Shite Kureru Yankee Onee-chan.
Eiken Adult Kirika ~With Love From the Milk Bags~
Acting Like A Normal Girl Today
Otona no Eiken 〜 Shinonome Chiharu 26-sai 〜
Onegai Anna Sensei New Chapters
[Goto Hayako] Nakitagari no Hana
Young Champion Retsu Vol.08 (2007-09-30 Zoukangou)
Young Comic 2008-09
Utakata Sagisawa Fumika
Otoko no Risou wa Sex Dekiru Okaa-san
[Matsuyama Seiji (Matsuyama Seiji)] Oppai Momu? [Digital]
Young Champion Retsu Vol.15
Eiken Rensai Kaishi 10-shuunen Kinen Bon Kaiteiban Sai
[Ribons Nights (Kyouno Aki)] Koisuru Matsuyama-san [Digital]
Otona no Eiken Kirika ~Chibukuro yori Ai o Komete~
(C91) [Matsuyama Seiji] Ura Eiken ZERO Remake (Eiken)
Otona no Eiken
Nyotaika de Ecchi Kenshin!? Mirudake tte Itta no ni... | 女體化後色情體檢!?說好只看不動手的呀… Ch.1-6
[Matsuyama Hayate] Nyotaika de Ecchi Kenshin!? Mirudake tte Itta no ni... 3 [Digital]
(C91) [Dr.VERMILION (Petenshi)] Voiceeroid + AI Yuzuki Yukari (Voiceroid)
[Matsuyama Seiji] Eiken Makaizou 4 (Eiken) [Digital]
[Matsuyama Seiji] Otona no Eiken ~Shinonome Chiharu 26-sai~ (Eiken) [Digital]
[AYA - guro] Mai's Story [Chinese]
Young Champion Retsu Vol.02
Young Champion Retsu Vol.17
[Matsuyama Seiji] Kinjo no Chuugakusei no Otokonoko ga Watashi no Mune o Chirachira Mite kuru node... Sex o Shite ageta Hanashi. [Digital]
Young Champion Retsu Vol.07 (2007-07-25 Zoukangou)
Trick and Trick!
(C81) [BOBCATERS (Hamon Ai, Matsuyama Seiji)] Yukiho Shinken (THE iDOLM@STER)
Gender Bender Into Sexy Medical Examination! You said that you were only going to look... 2
[Matsuyama Seiji] Loli-gao de Kyonyuu na Okaa-san ga Boku no Hatsutaiken. [Digital]
Young Champion Retsu Vol.11 (2008-03-30 Zoukangou)
[Matsuyama Seiji] Onegai Makoto Sensei (Space Battleship Yamato 2199) [Digital]
Manga Bon 2012-12
[Seiji Matsuyama] Ura Eiken ZERO (Eiken)