Amatsuki

Tokidoki Rikugou is a high school student who failed his Japanese History course and is forced to attend a special museum lecture to make up for the grade. The lecture features a large-scale recreation of the Edo Period, with a simulation of the Tokugawa Shogunate called the Edo Bakumatsu Walking Tour and Exhibition. While exploring this exhibit, Tokidoki is attacked by a demon on a bridge and saved by a swordsman named Kuchiha, who reveals that he is trapped in the simulation along with another character, Kon Shinonome.