Oyamada passed away in 2016. Since then the digital rights to most of his library appear to have been acquired by Taiyoh Tosho (大洋図書). Electronic editions of his works have been regularly released under Emperor's Comics (エンペラーズコミックス). This label is generally used for men's comics, but is here being used for all of Oyamada's works, regardless of the intended audience of the original publication.
Ao-iro Gakkyuu (青色学級)
Horror Comics (ホラーコミックス) edition, one volume, 1996
Publisher: Akita Shoten (秋田書店)
Size: Shinsho-ban (新書版)
Publication date: 02/1996
Stories included in this volume: Ao-iro Gakkyuu (青色学級), Karon (カロン), Jubokko (樹木子), Tensei Ningyo (転生人魚), Watashi ga Ita Machi (私がいた街), and Kare no Hon (彼の本).
Links
- Amazon.co.jp: 青色学級 (ホラーコミックス) (paid link)
Emperor's Comics (エンペラーズコミックス) edition, one volume, 2018
Publisher: Taiyoh Tosho (大洋図書)
Size: Ebook

Links
- Amazon.co.jp: 青色学級 (エンペラーズコミックス) (paid link)
Ano Akuma (あの悪魔)
Horror Comics (ホラーコミックス) edition, one volume, 1996
Publisher: Akita Shoten (秋田書店)
Size: Shinsho-ban (新書版)
Publication date: 08/1996
Stories included in this volume: Oodoshi no Kyaku (大年の客), Ano Akuma (あの悪魔), Kasuka na Hana (幽かな花), Youu Tsuzuri (妖雨つづり), and Yakusoku no Shi (約束の死).
Links
- Amazon.co.jp: あの悪魔 (ホラーコミックス) (paid link)
- Comic’s Room: 『あの悪魔』
Emperor's Comics (エンペラーズコミックス) edition, one volume, 2018
Publisher: Taiyoh Tosho (大洋図書)
Size: Ebook

Contents are the same as in the original release.
Links
- Amazon.co.jp: あの悪魔 (エンペラーズコミックス) (paid link)
The Devil
Serial Misteri edition, one volume, 2004
Publisher: Elex Media
Publication date: ??/2004
Indonesian release. The contents of this volume appear to be the same as in the Japanese editions: Tamu Malam Tahun Baru, The Devil, Dark Flower, Ghostly Rain, and Perjanjian Kematian.
Rinshikai yori (臨死界より)
Horror Comics (ホラーコミックス) edition, one volume, 1997
Publisher: Akita Shoten (秋田書店)
Size: Shinsho-ban (新書版)
Publication date: 03/1997
Included in this volume: Tama Tanabata (魂七夕), Okuribi Yurete (送り火ゆれて), Rinshikai yori (臨死界より), Wataridori-tachi (渡り鳥たち), and Yuki Furu Yoru ni (雪降る夜に).
Links
- Amazon.co.jp: 臨死界より (ホラーコミックス) (paid link)
- Comic’s Room: 『臨死界より』
Emperor's Comics (エンペラーズコミックス) edition, one volume, 2019
Publisher: Taiyoh Tosho (大洋図書)
Size: Ebook

Contents are the same as in the original release.
Links
- Amazon.co.jp: 臨死界より (エンペラーズコミックス) (paid link)
Akai Juujiro (紅い十字路)
Horror Comics (ホラーコミックス) edition, one volume, 1997
Publisher: Akita Shoten (秋田書店)
Size: Shinsho-ban (新書版)
Publication date: 11/1997
Contents are probably the same as in the Emperor's Comics release, although this has not been confirmed.
Links
- Amazon.co.jp: 紅い十字路 (ホラーコミックス) (paid link)
Emperor's Comics (エンペラーズコミックス) edition, one volume, 2018
Publisher: Taiyoh Tosho (大洋図書)
Size: Ebook

Contents of this edition: Yume ga Shitte iru (夢が知っている), Akai Juujiro (紅い十字路), Atashi ga Shinu Asa (あたしが死ぬ朝), Omokage Tsubame (面影燕), Kokuban (黒板), and Ite Chou (凍蝶).
Links
- Amazon.co.jp: 紅い十字路 (エンペラーズコミックス) (paid link)
Karappo no Inochi (空っぽの命)
Horror Comics (ホラーコミックス) edition, one volume, 1998
Publisher: Akita Shoten (秋田書店)
Size: Shinsho-ban (新書版)
Publication date: 05/1998
Contents are probably the same as in the Emperor's Comics release, although this has not been confirmed.
Links
- Amazon.co.jp: 空っぽの命 (ホラーコミックス) (paid link)
Emperor's Comics (エンペラーズコミックス) edition, one volume, 2019
Publisher: Taiyoh Tosho (大洋図書)
Size: Ebook

Contents: Jewel Box (宝石箱), Natsu no Owari (夏の終わり), Juu-nen Jigoku (十年地獄), Maboroshi no Mau Michi (幻の舞う道), Ochiba no Shita (落葉の下), Karappo no Inochi (空っぽの命).
Links
- Amazon.co.jp: 空っぽの命 (エンペラーズコミックス) (paid link)
Animal Dr. Yoshino (アニマルDr.由乃)
Book-ing (ブッキング) edition, one volume, 2004
Publisher: fukkan.com (復刊ドットコム) [formerly Book-ing (ブッキング)]
Size: A5 Wide-ban (A5ワイド版)

Publication date: 12/2004
The works included here all originally ran in Akita Shoten’s Susperia. This volume was apparently also made available by fukkan.com as Print-on-Demand.
Links
- Amazon.co.jp: アニマルDr.由乃 (fukkan.com) (paid link)
Emperor's Comics (エンペラーズコミックス) edition, two volumes, 2019
Publisher: Taiyoh Tosho (大洋図書)
Size: Ebook

Publication date: 03/2019
The works included here all originally ran in Akita Shoten’s Susperia.
Links
- Amazon.co.jp: アニマルDr.由乃 上巻 (エンペラーズコミックス) (paid link)

Publication date: 03/2019
The works included all also ran in Susperia.
Links
- Amazon.co.jp: アニマルDr.由乃 下巻 (エンペラーズコミックス) (paid link)
Kusunoki Tei no Hibi (くすのき亭の日々)
in Kimagure Joushaken (きまぐれ乗車券),
Book-ing (ブッキング) edition, one volume, 2006
Publisher: fukkan.com (復刊ドットコム) [formerly Book-ing (ブッキング)]
Size: A5
ISBN-10: 4-8354-4211-3
Publication date: 02/2006
Not to be confused with the Shogakukan release also titled Kimagure Joushaken (see under "Other Works"). This volume contains all three parts of the Kusunoki Tei no Hibi series as well as the boys’ titles Kimagure Joushaken (きまぐれ乗車券), Special Chef (すぺしゃる料理人), and Yakusoku (約束).
Links
- Amazon.co.jp: きまぐれ乗車券 (fukkan.com―小山田いく選集) (paid link)
Emperor's Comics (エンペラーズコミックス) edition, one volume, 2019
Publisher: Taiyoh Tosho (大洋図書)
Size: Ebook

This volume contains the three-part Kimagure Joushaken series as well as Special Chef (すぺしゃる料理人) and Yakusoku (約束).
Links
- Amazon.co.jp: くすのき亭の日々 (エンペラーズコミックス) (paid link)
Gohyaku Rakan (五百羅漢)
Book-ing (ブッキング) edition, one volume, 2006
Publisher: fukkan.com (復刊ドットコム) [formerly Book-ing (ブッキング)]
Size: A5

ISBN-10: 4-8354-4212-1
Publication date: 05/2006
The title piece is Oyamada’s debut work, published under the name Katsuhisa Tagami (田上勝久). The volume also contains another boys’ title, from Shounen Champion (少年チャンピオン), Sansou Yawa (山荘夜話). But all the remaining pieces originally appeared in Susperia:
- Saiko Nekomata ne! (災子 猫又ね!)
- Kinenju (記念樹)
- Kaze Mai (風舞人)
- Juu Zensen (呪雨前線)
- Sayonara Kano-chan (さよなら香乃ちゃん)
- Furuya no Mori (ふるやのもり)
- Matsuyoi Densha (待宵電車)
- Te (手)
- Horobi no Nikki (滅びの日記)
- Onryou Touge (怨霊峠)
- Haikou no Ichiya (廃校の一夜)
- Shiroi Ikai (白い異界)
- Elf* (えるふ)
This volume was apparently also made available by fukkan.com as Print-on-Demand.
Links
- Amazon.co.jp: 小山田いく選集2五百羅漢 (fukkan.com―小山田いく選集) (paid link)
Emperor's Comics (エンペラーズコミックス) edition, three volumes, 2019
Publisher: Taiyoh Tosho (大洋図書)
Size: Ebook

Publication date: 05/2019
The title piece is Oyamada’s debut work, published under the name Katsuhisa Tagami (田上勝久). This volume also contains the boys’ title Sansou Yawa (山荘夜話). Saiko Nekomata ne! (災子 猫又ね!), Kinenju (記念樹), and Kaze Mai (風舞人), all originally appeared in Susperia.
Links
- Amazon.co.jp: 五百羅漢 1 (エンペラーズコミックス) (paid link)

Publication date: 06/2019
The works in this volume all originally appeared in Susperia: Juu Zensen (呪雨前線), Sayonara Kano-chan (さよなら香乃ちゃん), Furuya no Mori (ふるやのもり), Matsuyoi Densha (待宵電車), and Te (手).
Links
- Amazon.co.jp: 五百羅漢 2 (エンペラーズコミックス) (paid link)

Publication date: 06/2019
The works in this volume also all originally appeared in Susperia: Horobi no Nikki (滅びの日記), Onryou Touge (怨霊峠), Haikou no Ichiya (廃校の一夜), Shiroi Ikai (白い異界), and Elf* (えるふ).
Links
- Amazon.co.jp: 五百羅漢 3 (エンペラーズコミックス) (paid link)
Other Works
Oyamada wrote primarily for boys. Most of these works were also published by Akita Shoten under the Shounen Champion Comics (少年チャンピオンコミックス) label and rereleased electronically by Taiyoh Tosho under Emperor's Comics:
- Scrap Book (すくらっぷ・ ブック) 1-11, partially rereleased by Book-ing in four volumes, and rereleased by Taiyoh Tosho in eleven volumes
- Hoshi no Locus* (星のローカス) 1-5, rereleased by Taiyoh Tosho
- Blue Peter (ぶるうピーター) 1-8, rereleased by Book-ing in three volumes and by Taiyoh Tosho in eight electronic volumes
- Wood Note (ウッド・ノート) 1-8, rereleased in four wide-ban volumes by Book-ing and in eight electronic volumes by Taiyoh Tosho
- Kimi wa Norn (きみはノルン) 1-3, rereleased by Taiyoh Tosho
- Mononoke Tomorrow (もののけトゥモロウ), rereleased by Taiyoh Tosho
- Dongame Submarine* (どん亀サブマリン), rereleased by Taiyoh Tosho
- Marionette Shi (マリオネット師) 1-11, rereleased by Taiyoh Tosho
- Reinou Battle (霊能バトル) 1-3, rereleased by Taiyoh Tosho
- Forna ga Hashiru* (フォーナが走る) 1-4, rereleased by Taiyoh Tosho
- Nemu Report (合歓リポート), rereleased by Taiyoh Tosho
- Last Scene (ラスト・ シーン), rereleased by Taiyoh Tosho
- Mayoiga Station (迷い家ステーション) 1-5, rereleased by Taiyoh Tosho
- Kaze no Yadori (風の宿) 1-8, rereleased by Taiyoh Tosho
- Muji na Chuuihou! (むじな注意報!) 1-5, rereleased by Taiyoh Tosho
- Queen Bee, rereleased by Taiyoh Tosho
- Inochi no Diary (生命のダイアリー), written by Kazuho Tachiyama (達山一歩)
There are a few more titles from different publishers or different labels. Kimagure Joushaken (気まぐれ乗車券) was published by Shogakukan (小学館) under Shounen Bic Comics (少年ビックコミックス). Akita Shoten put out Locomotion (ろこモーション) 1-3 under Sunday Comics (サンデーコミックス), rereleased electronically by Taiyoh Tosho. Shuurakuen (衆楽苑) was published by Akita Shoten in two volumes under Champion Jack Comics (チャンピオンJACKコミックス), again by Book-ing in a single wide-ban volume, and electronically in three volumes by Taiyoh Tosho. Sudama (魑魅) was originally from Scholar (スコラ社) under Scholar Comics Burger (バーガーSC), then rereleased in two volumes by Sony Magazines (ソニー・マガジンズ) under Birz Comics (バーズコミックス), again in a single volume by Book-ing, and again in two electronic volumes by Taiyoh Tosho.
Oyamada did the illustrations for Manga de Wakaru Soft Kaihatsu Nyuumon Kouzouka Programming no Susume (マンガでわかるソフト開発入門 構造化プログラミングのすすめ), published by Nikkei BPM (日経BPM). He also contributed to Kiseki no Spiritual Power Kyoui no Healer Asahi Taro: Manga Makkigan mo Kokufuku!* (奇跡のスピリチュアル・ パワー驚異のヒーラー旭太郎 まんが末期がんも克服!) from Kaiohsha (海王社).
Ladies' titles drawn by Oyamada include the "true horror" collections Inagawa Junji no Saishin Kowai Hanashi (稲川淳二の最新・ 怖い話) and Inagawa Junji no Kyoufu Shinrei Gatari (稲川淳二の恐怖心霊がたり), published by Bunkasha (ぶんか社). Both titles were also rereleased electronically; the first can be purchased as a single volume or as a series of seventeen separate parts. He had works included in Bunkasha's Manga Grimm Douwa (まんがグリム童話) anthologies Aiyoku no Toriko Hen (愛欲の虜編), Shussan to Datai no Rekishi Hen* (出産と堕胎の歴史編), Jinshin Baibai no Yami Hen (人身売買の闇編), and Oooku Zankoku Shi (大奥残酷史). The very last new volume that Oyamada released appears to be the digital-only single-author Manga Grimm Douwa (まんがグリム童話) title Saikasou Inbai Yuujo* (最下層淫売遊女).
Posthumously, the short piece Michi wa Concerto* (道はコンチェルト), a joint work with Oyamada's brother Yoshihisa Tagami (たがみよしひさ), appeared in the first volume of the latter's Bunkasha series Waga Na wa Wolf (我が名は狼). Gogo no Akuma* (午後の悪魔), adapted by Oyamada from the story by mystery writer Kyoutarou Nishimura (西村京太郎), was included in both Comic Keiji Mystery Kessakushu 5: Kondaku no Jashin Hanzai Hen (コミック刑事ミステリー傑作集5 混濁の邪心犯罪編 and Keishicho Totsugawa Keibu no Jikenbo & Tetsudo Mystery Best Comic (警視庁十津川警部の事件簿&鉄道ミステリーベストコミック) 7, volumes of digest anthology series published by Akita Shoten under Akita Top Comics Wide.