Sprechchor to Houteishiki | Chorus and Formula
Taimadouteishi Midori Ero 05
[Sena Youtarou] Kannou no Christmas Eve (Kannou no Houteishiki) [English] [Team Koinaka]
[Hagiyoshi] Intou Kyuuteishi ~Intei to Yobareta Bishounen~ Ch. 2 [Chinese] [不可视汉化]
Kannou no Houteishiki (decensored)
Zutto Miterune
[Hiyoshi Hana] Chigiri to Musubi no Houteishiki - Equation of Chigiri & Musubi [Digital]
(C70) [Neko Kinryouku (NekoNeko)] NekoNeko Otona Houteishiki
Taimadouteishi Midori Ero 03 JK Taimashi VS Futanari Choukyoushi!
(C89) [Shiratamaco (Shiratama)] Usagi Syndrome 2 (Gochuumon wa Usagi desu ka?) [English] [cuteisanarchy]
[Ooishi Chuuni] Futon Otoko | FutonMan (Action Pizazz 2014-09) [English] {2ez4rtz}
[Sena Youtarou] Kannou no Hirusagari | A Sensual Early Afternoon (Kannou no Houteishiki) [English] [Decensored]
[Akuochisukii Sensei] Akuochisukii Sensei no Heroine Haiboku no Houteishiki - Equation of Heroine's defeat by Mr. Akuochisukii [Digital]
[Warabimochi] Taimadouteishi MIDORI ERO 01 VS Taburakashi Oji-san Bishoujo Taimashi ni Osoikakaru Dosukebe Saimin Kougeki! [English] [constantly]
[Warabimochi] Taimadouteishi Midori
[Momonga Club (Hayashibara Hikari)] Shoujo no Houteishiki - Girls of Equation [English] [SaHa] [Digital]
[Bousou Tenshi-UPsideDOWN (Sakatani Shinnosuke)] Koi no Renritsu Houteishiki (Yu-Gi-Oh! GX)
[Kinako Gyuu Nyuu (Tomoharu)] Koi Suru Houteishiki (Ginga e Kickoff!!)
[Carn] Natsu x Umi = Kiken no Houteishiki | Summer x Beach = Dangerous Equation (Shinzui SUMMER Ver. Vol. 2) [English] [Rage Manga] [Decensored]
[Sena Youtarou] Kannou no Houteishiki
[Warabimochi] Taimadouteishi Midori Ero 02 JK Taimashi VS Futanari Choukyoushi
Chigiri to Musubi no Houteishiki - Equation of Chigiri & Musubi
(C86) [Shiratamaco (Shiratama)] Usagi Syndrome (Gochuumon wa Usagi desu ka?) [English] [cuteisanarchy]
Nagashi no mahou