Miki Otani

Nina, thinking it was a lolly, swallows an object called "Crystal Pearl". But the candy turns out to be a test for the magicians. To retrieve the crystal, a special medicine has to be made so now Zero and Ichii, the magicians, have to protect her from others while waiting for the medicine to be completed. (myanimelist.net)

Ultraman Dyna and Ultraman Cosmos entrusted their powers to Ultraman Zero... but he doesn't know why. Can he find out in time to overcome the hatred of those he's defeated? And with the help of his brothers in arms, Ultimate Force Zero, can he fight the darkness that seeks to conquer the entire galaxy? (Ununnilium)