OVA which was released as a tie-in to the Kandagawa Jet Girls video game for PlayStation 4.

After losing a bet, Keiichi, Mion, Rena, Satoko and Rika parade around the town in costumes. When they come to a fork in the road, they decide to go to Yagouchi, a nearby abandoned village. Once there Keichii and Rena learn the mystery of a strange haunted quarry as they debate whether or not to check it out.

Tokidoki Rikugou is a history-hating student who flunks out of his Japanese History course; his high school forces him to make up for his failed grade by attending a special museum lecture. Its star exhibit, a vast recreation of the Edo Period, promises to alleviate the delinquent student's poor grades with an elaborate simulation of the Tokugawa Shogunate: the Edo Bakumatsu Walking Tour and Exhibition. Knowing next to nothing about samurai culture or the times he's walked into, he is quickly surprised to learn of the superstitious nature of Japan during the 1600s. Quickly dismissing the existence of gods and demons, he is shocked when confronted by a demon on a bridge, who attacks the unsuspecting high-schooler. Saved by a mysterious swordsman named Kuchiha, he discovers that he can no longer escape the simulation at the history museum. Meeting another swordsman named Kon Shinonome, he discovers another contemporary that was trapped in the simulation before him. Quickly adjusting to his new home, Tokidoki must now help protect the village from demons, while uncovering the mystery of both the simulation and the company that created it. [Written by MAL Rewrite]

Six thousand years ago, mankind's glorious reign ended as a result of an invasion of the demon race, brought about by the emergence of 72 demon gods. To safeguard the remnants of humanity, the Alliance of Temples appeared to stop the demons' progress and temporarily stabilize the situation. At present, nine-year-old Long Hao Chen is training to become a part of the Knight Temple Hall. Through sheer dedication and the support of his companions, he passes the knight exam. Now, under the tutelage of his teacher Long Xing Yu, Long Hao Chen endures the Holy Resurrection Ritual to ascertain his capability. The ritual reveals that Long Hao Chen is a Son of Light—an individual who possesses a vast amount of spiritual energy. Recognizing his disciple's promising potential, Long Xing Yu urges Long Hao Chen to become a strong knight capable of defeating the Demon Lord alongside him. With countless challenges awaiting him, Long Hao Chen may be the warrior that can end the era of darkness.