In/Spectre manga volume 19 features story by Kyo Shirodaira with illustrations by Chashiba Katase.

Kotoko's nemesis Rikka is back, and it's a battle between artificial intelligence and the Goddess of Wisdom. Rikka develops Mecha Kotoko: an advanced technological machine programmed to mimic yōkai supernatural powers. The doppelganger outrages Kotoko, but fools the real yōkai. Up against a seemingly all-knowing artificial version of herself, can Kotoko still emerge as the superior sleuth? A plethora of mysteries awaits in this collection of suspenseful short stories!