First Look: Tower of God

A boy called Bam (Yoru?) has spent nearly all his life beneath a huge tower, with only his friend and rescuer, Rachel (Rahel?), by his side. When Rachel/Rahel decides she wants to climb to the top of the tower and disappears, Bam/Yoru manages to follow her inside, where he is faced with a number of deadly challenges at each level on his quest to find her again.