source by : doujinantena.com

Doujinshi.org - https://www.doujinshi.org/book/1613046/Kouhai-Servant-ga-Dosukebe-na-Ken/

Melonbooks - https://www.melonbooks.co.jp/detail/detail.php?product_id=334509 (Incorrect Circle listed)

Suruga-ya - https://www.suruga-ya.jp/product/detail/ZHOI93875

Twitter (Circle confirmation) - https://twitter.com/k_l_c_y/status/959331466369843200

Chinese [CE家族社] - https://e-hentai.org/g/1163982/22fb69c066/

Korean [팀☆데레마스] - https://e-hentai.org/g/1164706/a1293b1486/

Artist - Killcy (きるし)

Alias: Oshiruko (お汁子) / Oshiru-P (お汁P) <- Vocaloid related art <- see - https://danbooru.donmai.us/artists/67713 / PulltaV (ぷるたヴ)

Circle - Namahamu Tabehoudai 390 Yen (生ハム食べ放題390円) <- Not verified

Other Circle - Namahamu Melon Soda (生ハムメロンソーダ) (ナマハムメロンソーダ) <- Not verified

Namahamu Melon Soda katakana from - https://www.melonbooks.co.jp/circle/index.php?circle_id=54535

Killcy Home Page (Blog) - https://ameblo.jp/kazemaru-0202/ (Old - Last entry 2013-01-18)

Killcy Pixiv - https://www.pixiv.net/member.php?id=1417064

Killcy Nico Nico Seiga - http://seiga.nicovideo.jp/user/illust/18141169

Killcy Piapro - https://piapro.jp/m393924

Killcy Booth - https://killcy-oshiruko.booth.pm/

Killcy Twitter - https://twitter.com/k_l_c_y

Killcy (PulltaV) Twitter (Adult) - https://twitter.com/pulltav

Killcy Pawoo - https://pawoo.net/@killcy

Base +47, TheGreyPanther +57