The Holy Knights in the Orphanage

On September 13, 2035, the high-dimensional "World Eater" passed by the earth every 24 hours, and the dimension flipped 93 days later; humans relied on "Heartbeat Synchronization T-0" to awaken the fairy-tale "Glory Word" power. Between the neon and the blue crack, they used children as knights and faith as weapons to count down to 93 days to protect the world.