I will be honest, Made in Abyss hooked me from the very first episode. I mean, the worldbuilding, the music, the gorgeous scenery, everything about it was wonderfully directed and it really draws the viewer in and puts them on the edge of their seat.
One reason is is so good is because it takes every effort to draw you in with a show don't tell approach that I feel a lot of shows just ignore. Everything about it makes you want to know more. No matter if it is a tidbit abot their world or finding out how the protagonist continues their adventures.
I would really like to say that this is "the" new series, but it is still new. It will be hard to say if Made in Abyss will continue on, but it definitely has an amazing first episode.