Shikizakura

Kakeru Miwa, a high school student, gets involved in a battle between powered suits and oni that emerge from the demon world. Oni manifest themselves in this world by possessing humans. Only "Yoroi", powered suits that are a fusion of ancient secrets and cutting-edge technology, can protect people from oni. Kakeru puts on a Yoroi by chance and becomes a semi-official member of a team that fights against oni.