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In 20XX, the Hanami festival in Kyoto takes a terrifying turn when the "Sacred Sakura" bursts with supernatural light, opening a vortex to a world filled with yokai. This unstable portal chaotically connects two worlds, forcing Japan to adapt to the existence of yokai and the magic that seeps into its reality. When his younger sister is pulled through the vortex, a young man must confront his myths and venture into the unknown to save her.