Adult PC Game: JK Gakuen Seishun Hakusho -Kamen Yuutousei "Miyuki"- by Red Rebel (Jap) Archive

Miyuki Matsuzaka is the most beautiful and talented girl in school and the main character (you) is lucky to be in the same class with her. But one day the main character finds the lost notebook Miyuki and decides to take it to her. But the GG meets a different Miyuki, looks different, the character is different than at school ...
If the GG does not give her secret to anyone else, then he can ... (then choose for yourself, you are a demon or an angel and which path you will follow).