In a forest, a child from another world named Ultra B (UB) with distinctive features like red sunglasses and a star-shaped mark on his cheek, crash-lands in his spaceship. Alone and disoriented, UB is discovered by a kind schoolboy named Michio who offers him refuge. To Michio's surprise, UB is no ordinary kid; he possesses extraordinary supernatural abilities. Grateful for Michio's hospitality, UB attempts to assist him using his powers, but things don't always go as planned. When faced with a menacing black cat, UB struggles to control his abilities, leading to unexpected consequences.