Oni Zero Fukattsu [Pandora Max Series Vol.6]

In the year 924 AD, 3 young kids are going to play in the shrine of the mountains but soon they will discover that something is not going right around there and they will start a dangerous journey to destroy the devils that are trying to destroy the world. The characters can transform themselves into a shape of a demon during a few times in the battles, the battle can be a little slow since is turn based and some enemies takes some turns to be defeated.