Kujo being able to control when he regrows his body parts is actually pretty interesting. Now, the author has a choice, go the bullshit route and make the yakuza's bitch get spared after bullying, assault, attempted gangrape, torture, and attempted murder of the protagonist for the sake of "redemption" or to take the "moral high ground", Kujo's just gonna heal and do it for her so she doesn't go crazy, or Shizuku kills her by hand, goes crazy, and then has Kujo calm her down. If the author chooses to spare her though, after all of the horrific things she's done to Airi, this series is going to get dropped faster than a dumbbell out of an airplane.