Shinobu is a girl who lives with Meme in an abandoned building. She loves donuts from "Mister Donut." She was named Shinobu by Meme at the beginning of Hitagi Crab, suggesting her kanji name Shinobu (忍), having "heart" (心) under "blade" (刃), matches with her original personality.

Generally referred to as either "I" (わたし Watashi) or "Ms. Sweets" (お菓子ちゃん Okashi-chan), the main character is a girl with long pink hair who serves as a mediator between human kind and the fairies. She is initially seen with short hair. Due to a FairyCo. hair growth product her hair is alive. Her weapon of choice seems to be knives. Though seemingly a very kind and caring person, Watashi's personality is that of a fox. She is presented as a very cunning and observant character, and prioritizes her well-being over everything else. She also seems to be fond of witty, ironic comments and has shown a rather pessimistic approach to life. Light Novel Spoiler: