In a world devoid of emotion, Hitomi Tsukishiro experiences life in monochrome until her grandmother, Kohaku, casts a spell during a fireworks display, transporting her back to 2018. Tasked with an ambiguous mission, Hitomi lands in Yuito Aoi's art-filled room, where his vibrant drawings bring color to her existence. As Hitomi navigates this mysterious journey through time, the significance of her presence and the connection to Yuito's artwork unfold.