Inmu Gakuen: "Dame... Konna ni Nacchau no wa Yume no Naka dake na no...!" - Inmu ni Torawareta Bijin Shimai(2010)

Inmu Gakuen is an adult anime series following Shinji, a high school student infatuated with his classmate Mayuri. When a mysterious teacher named Ryoko gives him a pendant said to grant pleasant dreams to those who sleep with it, Shinji begins to question reality itself. The next morning brings confusion rather than clarity, and the pendant's true purpose remains shrouded in mystery. As Shinji investigates further, he discovers that the boundary between dreams and waking life may be far more blurred than he imagined, drawing him into increasingly surreal and unsettling circumstances that challenge his understanding of what is real.