[Azuki Kurenai] Midara no Houteishiki: The Equation of the Immoral
[Kinako Gyuu Nyuu (Tomoharu)] Koi Suru Houteishiki (Ginga e Kickoff!!)
[20nKai] Gesu na Shachou Gonomi no Fetish Boots [Digital]
Koi no Riron Ai no Houteishiki
(C59) [Tomoyosama (Kayama Akihiro, Ozawa Hiroe)] Tomoyo No Yasashii Houteishiki (Cardcaptor Sakura)
[Carn] natsu×umi=Kiken no Houteishiki (Shinzui SUMMER Ver. Vol. 2) [Decensored]
[Azuki Kurenai] Yoru no Houteishiki 1 | Equation of the Night 1
[Bousou Tenshi-UPsideDOWN (Sakatani Shinnosuke)] Koi no Renritsu Houteishiki (Yu-Gi-Oh! GX)
[Gentsuki] Yasashiisa no Houteishiki - Tender equation (COMIC BAVEL 2017-08) [Chinese] [揮淚錦馬超漢化] [Digital]
(C74) [Momonga Club (Hayashibara Hikari)] Shoujo no Houteishiki - Girls of Equation
[Shirakawa Tomoaki] Sou, Sonomama Nomikomi Nasai Watashi no Dorichin Gungnir | Swallow My Drillcock Gungnir (Touhou Project) [English] [LWB + Chocolate]
[Ecologist (moro)] Sonoyasashisaha. Mawatanoyouni Yawarakaku [Digital]
Neji to Nejiana no Houteishiki
[Hiyoshi Hana] Chigiri to Musubi no Houteishiki - Equation of Chigiri & Musubi [Digital]