Blue Exorcist: The Movie

In "Blue Exorcist: The Movie," Rin Okumura (Jun Fukuyama) is tasked with suppressing the berserk Phantom Train, but he meets a demon boy named Usamaro (Yuki Kaji) who becomes his unlikely friend and companion. As they live together, Usamaro uses his power to make Rin and their friends forget about their duties, causing chaos in the town. Despite this, Rin helps Usamaro understand the value of memories and makes him promise not to use his power again. In the end, Usamaro sacrifices himself to save the city, but Rin remembers him and vows to honor his memory.