Despite the colorful enchantment that pervades everyday life, Hitomi Tsukishiro's monochromatic universe lacks heart and feeling. On a night as black and white as any other, amidst the fireworks, Hitomi's grandmother Kohaku crafts a magic, for which she has been harnessing the moon's light for 60 years, to transport Hitomi to the year 2018, when Kohaku was in high school. Hitomi's objective appears to be hazy, but her grandma tells her that she will know when she arrives. Following a voyage through time aboard a weird yellow creature-driven train, Hitomi finds herself in the chamber of stoic artist Yuito Aoi, and his sketches fill her world with color. What is Hitomi's role there, and why is she there?