Hitagi, the main character of Hitagi Crab, is a weak-looking girl with an "incurable disease". She is in the same class as Koyomi, but she rarely speaks. During the period between graduating middle school and entering high school, she encountered a giant crab who stole her weight. Ever since, she has avoided contact with everyone else, and threatens anyone who discovers her secret. She became anti-social and was very different from her personality from when she was in middle school. She calls herself a tsundere (but is mostly a kuudere) and always speaks in an abusive style. At the end of Mayoi Snail, she admits that she loves Koyomi, and they start dating.