Earth has regained peace, but a new enemy with space-time powers has arrived! Musashi, Cosmos' host, tells the UPG that the Ultra Warriors have been sealed inside an evil space-time castle by a warrior woman named Arina. The fate of the entire world will be at stake. Hikaru and Shou are not strong enough to face this enemy, but if they can learn to fuse their hearts, they stand a chance. But to do that, they first must survive the training of Ultraman Zero!

Leon, who has succeeded the name of Golden Knight "GARO," devotes himself to train a young Makai Knight for the next generation, together with Prince Alfonso of the Valiante Kingdom. Then, they receive an order to exterminate the most beautiful Horror in the world which resides in a neighboring country "Vazelia." At the same time, a young Makai Knight for the next generation is kidnapped by an unknown person. Leon desperately follows them, only to find that he is surrounded by his enemies at a dead end. Then, a Makai Knight Dario who was supposed to be missing for some time suddenly appears and rescues him. Under his guidance, Leon is led to the town where he meets up a totally unexpected person.

Haruna who devoted herself to softball decide to find a boyfriend in high school by instruction from Yoh, who is willingly to teach her how to get a boyfriend but with only one condition, don't fall in love with him at all.