An Author with a huge hammer "The Sledgehammer of Crushing Disintegration" made it to town wrecking through building, and even though the Professor says there is nothing to worry about, Kiri doesn't agree and fears the worst. Today they are invited to Kashiko Misumi's salon house; Iwai admires Kashiko being attractive since she works to be a model. Kiri and Iwai witness a crime scene caused by the Sledgehammer so Kiri decides to stay overnight with Iwai much to their embarrassment. As Iwai bathe, Kiri reveals to her about his ancestor, Norma Grayland, who was an infamous foreign serial killer to have killed 200 people. Then a blackout happens, Iwai jumps out and hugs Kiri naked. It strikes midnight as her hair processing grows to Kiri’s enthusiasm. The mindless Sledgehammer breaks through the wall and begins chasing Iwai. Kiri fearlessly defeats the Sledgehammer guy who later commits suicide. Kiri vows to help Iwai even if he has to become a murderer himself.