Amatsuki(2008)

Amatsuki is an anime series following Rikugou Tokidoki, a struggling high school student forced into supplementary history classes at a cutting-edge museum. The facility uses advanced virtual reality to recreate the Edo period during the Bakumatsu era. When Tokidoki enters the simulation, a mysterious creature attacks him, and he discovers something terrifying: his VR goggles are gone. He's no longer in a simulation—he's trapped in the virtual world with no way home. As Tokidoki navigates this dangerous reconstructed past, he must uncover the truth behind his predicament while surviving in a world that feels increasingly real. The series blends historical fiction with science fiction, exploring themes of reality versus illusion as the protagonist searches for answers.