Chaos Wars

Legend says that in the mountains, there is a cave that leads to another world. There, there is a shrine, where the founder of the village is said to have come from, and where you can pray to a god to have any wish granted. After seeing a pillar of light coming from the mountain in a dream, Hyoma Kusaka, diligent student that he is, ditches class to go take a look along with his friends Shizuku Mizuki and Hayatemaru Mudouin. They find themselves transported to a mysterious world, with no idea how to return.