Rina-chan Renai Houteishiki
[Akuochisukii Sensei] Akuochisukii Sensei no Heroine Haiboku no Houteishiki - Equation of Heroine's defeat by Mr. Akuochisukii | 女性角色敗北的方程式 [Chinese]
[Comic Kingdom (Koyama Unkaku)] Kimiko Kannou Monogatari + Sophia Kannou Monogatari (True Love Story, Mitsumete Knight) [Digital]
Chigiri to Musubi no Houteishiki - Equation of Chigiri & Musubi
[Fumizuki Kou] Koi suru Houteishiki
Sprechchor to Houteishiki | Chorus and Formula
[Fuyujin Sora] Fuyujin Sora Kannou Gekiga Sen ・ Nikuyoku Jidai
Kanojo wa Kannou Shousetsuka ch30
[Momonga Club (Hayashibara Hikari)] Shoujo no Houteishiki - Girls of Equation [Digital]
Neji to Nejiana no Houteishiki
Kannou no Houteishiki (decensored)
Yuumei Chara Kannou Shousetsu CG Collection No. 248!! Sword Art Online II HaaHaa CG Shuu
[Sena Youtarou] Kannou no Hirusagari ~Climax~ | Afternoon Sex (COMIC Penguin Celeb 2010-10) [English] [Munyu]
[Bousou Tenshi-UPsideDOWN (Sakatani Shinnosuke)] Koi no Renritsu Houteishiki (Yu-Gi-Oh! GX)
Yuumei Chara Kannou Shousetsu CG Shuu No. 317!! One Piece 5 HaaHaa CG Shuu
[Azuki Kurenai] Midara no Houteishiki - The Equation of the Immoral [English] [hen-toy]
Yuumei Chara Kannou Shousetsu CG Shuu No. 351!! Bakuon!! HaaHaa CG Shuu