Guilty eX (now part of a larger holding company) has historically not supported English releases for their older catalog. While some newer Guilty titles have seen Steam releases (often heavily censored), Saimin Gakuen remains a Japan-exclusive title.
Please note: This article discusses a niche visual novel and the technical/legal landscape surrounding fan translations. Reader discretion is advised regarding the mature themes of the source material. Saimin Gakuen English Patchl