Equation of Mystery and Love

[Hiyoshi Hana] Equation of Mystery and Love (COMIC X-EROS #17) [English]

[Hiyoshi Hana] Kare to Imouto no Houteishiki | The Equation of Him and His Little Sister (COMIC Megastore 2012-08) [English] [The Lusty Lady Project]

[Hiyoshi Hana] Neko to Watashi no Houteishiki | The Equation of the Cat and Me (COMIC Megastore 2012-02) [English] [The Lusty Lady Project]

The Equation of the Cat and Me

The Equation of Him and His Little Sister

The Equation of the Maid and the Assistant

[Kitagawa Mizuki] Love Moe Equation

Love Equation

[Mokusei Zaijuu] A Virgin's Netorare Rape and Despair - Mystery Location Edition [English] =LWB=

[STUDIO AWAKE] Nyotai no Himitsu (Mystery of the Female bodies) <Educational Comic:Biology and sex #4>

Sexual Parody CG series vol. 29 | Retro Heroine-kei Sakuhin > Carmen ’99 cm | Woman with 99 Mystery and 99cm boobs

[Gentsuki] Yasashisa no Houteishiki | Tender Equation (COMIC BAVEL 2017-08) [English] [N04H] [Digital]

[Gentsuki] Yasashiisa no Houteishiki - Tender equation (COMIC BAVEL 2017-08) [Chinese] [揮淚錦馬超漢化] [Digital]

[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]

[Hiyoshi Hana] Chigiri to Musubi no Houteishiki - Equation of Chigiri & Musubi [Chinese] [無邪気漢化組]

[Hiyoshi Hana] Chigiri to Musubi no Houteishiki - Equation of Chigiri & Musubi

[Hiyoshi Hana] Chigiri to Musubi no Houteishiki - Equation of Chigiri & Musubi [Digital]

[Momonga Club (Hayashibara Hikari)] Shoujo no Houteishiki - Girls of Equation [English] [SaHa] [Digital]

[Akuochisukii Sensei] Akuochisukii Sensei no Heroine Haiboku no Houteishiki - Equation of Heroine's defeat by Mr. Akuochisukii [Digital]

[Azuki Kurenai] Midara no Houteishiki - The Equation of the Immoral [English] [hen-toy]