Malevolent Spirits: Mononogatari manga volume 10 features story and art by Onigunsou.

After one of the new Saenome staying at the Nagatsuki house is brutally attacked, suspicion turns to the Nagatsuki Dowry. Even Hyoma's considered a suspect, and no amount of evidence seems to be enough to dissuade the powerful Yachimata family from locking everyone up. Now the Nagatsuki Dowry faces a fate worse than death, and Hyoma is unable to free himself of his own bonds to help. It's up to Botan - and an unlikely ally - to uncover the truth before it's too late!