Kaiba” is the most interesting animated series I have seen in a long time. It pained me to pay attention to or be distracted by anything else while watching it. What a jewel. 
Echos of “Les Maîtres du Temps” and “Astro Boy”, and a movement and animation style that Space Dandy definitely homages. Not to mention an incredible soundtrack and absorbing story line.
Altogether unique and breathtaking.