Tengai-san wa Angai Futsuu

Yūko Tengai moves to Tokui during an unusual season to investigate evidence that could exonerate her older brother in a murder case from a decade prior. She partners with Masaki Maki, a classmate who spent eight years in a coma, and Maki's brother, who communicates using a robot from a zashikirō, a traditional Edo-style confinement room. The city is known for a legend involving two monsters. Yūko possesses a hidden true form.