[Kazakami Shun] Active Renai Houteishiki Official Visual Book
[Aura Seiji] Tanpopo Houteishiki [Korean] [Erokiwi]
[Azuki Kurenai] Yoru no Houteishiki 1 | Equation of the Night 1 [Korean]
[Psy Walken]ESCAPE [Kuro no Danshou SS][Es no Houteishik] Comic & Rough-draft Collection
[Azuki Kurenai] Midara no Houteishiki - The Equation of the Immoral [Spanish] [Pockemoncrew]
[Hiyoshi Hana] Kare to Imouto no Houteishiki (COMIC Megastore 2012-08) [Thai ภาษาไทย] {T@NUKI}
[Sakura Hikomaru] Imouto no Houteishiki [Chinese]
[Sena Youtarou] Kannou no Koukishin (Kannou no Houteishiki) [Chinese] [篆儀通文書坊漢化]
[Hiyoshi Hana] Chigiri to Musubi no Houteishiki (COMIC ExE 01) [Chinese] [無邪気漢化組]
[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 [Digital]