In/Spectre Vol. 12 (Kodansha, 2020)

As Rikka continues her solitary journey, she makes the acquaintance of one of Kotoko's high school friends, who reminisces fondly of their days in the Mystery Appreciation Club theorizing about dying messages. Meanwhile, a snow demoness has a request for Kotoko, hoping the revered Goddess of Wisdom can find a way to exonerate her human friend of some very serious charges…