Shiki Ryougi steps between high-schooler Tomoe Enjou and the bullies cornering him in the rain, then takes him back to her apartment after he confesses that he has just killed his parents. The trail leads to the Ogawa Apartments, a yin-yang-shaped tower whose tenants seem to reset each morning, with the architect Souren Araya pulling the strings from a sealed lower floor. Working with Mikiya Kokutou and the magus Touko Aozaki, Shiki picks at the building's geometry as Tomoe tries to remember what is actually his. This is the fifth and longest chapter in the seven-film Kara no Kyoukai cycle.