This route explores the relationship between Shiki and Arcueid. It is a tale of tragic romance and cosmic horror, as Shiki becomes Arcueid's reluctant ally in her hunt for a rogue vampire. It delves into the nature of her existence and Shiki's struggle to accept his lethal eyes. 2. Rainbow of Night (Ciel Route)

The title “A piece of blue glass moon” refers to the “Moon” as both a celestial body and a metaphorical concept for the fragility of the world/unreality within Tsukihime ’s cosmology.