Third installment of the "Gakko No Kaidan" series follows the trek of several elementary school students as they wander into an alternate world that exists on the opposite side of a school mirror. Nishida Naomi (the hapless teacher in "Gakko No Kaidan 2") returns as the teacher who accompanies the children on their journey into the surreal universe.
| Actor | Role |
|---|---|
 Naomi NishidaKaoru Yahashi | Kaoru Yahashi |
 Aki MaedaMayuko Fujii | Mayuko Fujii |
 Hitomi KurokiMachiko Kubota | Machiko Kubota |
| TTakuma YoshizawaRyô Kubota | Ryô Kubota |
| TTakeru HigaTaichi | Taichi |
| SShiori YonezawaAkane Sato | Akane Sato |
| KKazuto YamadaMakoto Ôta | Makoto Ôta |
 Toshiyuki ToyonagaSatoru Kimura | Satoru Kimura |
 Kenta SatoiYoshio Kimura | Yoshio Kimura |
 Hideki NodaSchool Teacher | School Teacher |
 Yukijiro HotaruPoliceman | Policeman |
 Hironobu NomuraTeacher Tameyama | Teacher Tameyama |
 Masahiko TsugawaSchool Master | School Master |
| MMachiko WatanabeMakoto's mother | Makoto's mother |
 Hayashiya Shōzō IXJinmenken dog | Jinmenken dog |
| SSaki AoshimaYumi | Yumi |
| KKei SaitôTakuya | Takuya |
| YYōko YoshimuraNopperakâsan | Nopperakâsan |