Cencoroll (2009)

Ignoring the natural laws of time and space, a mysterious creature materialises out of nowhere, hovering mid-air. As the gargantuan entity dwarfs the city's towering buildings, striking fear in the hearts of men, Yuki, a dauntless high school girl, chances upon cryptic Tetsu and his unexpected secret: Cenco, a rotund shape-shifting entity. Indeed, it seems that a strange but profound telepathic bond unites the two diverse symbiotic beings; however, the massive companion has already started to catch unwanted attention, and Tetsu is not the only one who can control such organisms. Now, Shu, a formidable adversary, has set his sights on capturing Cenco at all costs. Who shall prevail in the inevitable final confrontation?