Kami no Tou
神之塔 -Tower of God
Tower of God centers around a boy called Twenty-Fifth Bam, who has spent most of his life trapped beneath a vast and mysterious Tower, with only his close friend, Rachel, to keep him company. When Rachel enters the Tower, Bam manages to open the door into it as well, and faces challenges at each floor of this tower as he tries to find his closest companion.
I just loved this anime, so much that I went on to read the webtoon, then realized how badly the anime was made and the webtoon is fucking amazing
i read the whole webtoon in like 5 days lol it was so good and now im waiting for the author to resume the series because its in an indefinite hiatus, right after a cliffhanger……….