Shikizakura S01

Shiki-zakura, a land where cherry blossoms bloom at the same time as the leaves turn red, is about to hold a ceremony to save the human world in a special place where the mortal world and the other world are connected. "Miwa Kakuro" is a high school student who accidentally gets involved in the battle between the inhabitants of the other world, who wear iron armor, and an oni. Oni can appear in our world by possessing humans, and the only way to protect people from them is through "Yoroi", iron armor made from a combination of ancient secret arts and modern technology. Kakuro unexpectedly puts on one of these armors and fights an oni, and this is how he decides to become a hero to save the world.