In/Spectre Vol. 15 (Kodansha, 2022)

A deadly incident in the mountains claims the lives of three victims and leaves one fighting for his life. As Kotoko and Kurô prepare to investigate the involvement of a vengeful giraffe spirit, who should they find at the scene but the elusive Rikka Sakuragawa! Though the trio agree to cooperate on the case, Kotoko can't help but wonder what Rikka may have in store…