Reiko Kashima (カシマレイコ), also known as the Slit-Mouthed Woman (口裂け女), is a yokai that formerly resided in a ruined area in Kamigoe City. After being bested by Momo, Reiko Kashima harbored a grudge against the girl and vowed to get revenge on her the next time they met. However, after observing her relationship with Okarun, Reiko Kashima let go of her resentment and changed her mind in finding a suitable partner. In Dandadan, she serves as one of the main antagonists during the Space Globalists Arc.