Blade Children

A young boy named Kie Kinsely and his brother Max discover they are part of an ancient, ongoing war between angels and demons after receiving mysterious books from their grandfather. As "blade children," they gain the ability to see supernatural beings and are transported to the spiritual world to face formidable foes. Their journey involves navigating mysterious worlds, confronting fallen angelic beings, and uncovering secrets about the universe, all while striving to return home.