Mamimi Samejima

Mamimi has medium-length, reddish-brown hair, brown eyes and full, pouty lips. She seems to be always wearing her school uniform, but often loses her shoes when she gets bullied and is forced to go around barefoot. She carries around a light blue bag with a white cross on it. Mamimi is a pyromaniac and loner who has the peculiar tendency to name people and things "Ta-kun" (sometimes spelled "Takkun"), after her personal nickname for Naota's brother and Naota himself. It is possible she does this because she is trying to replace the relationship and feelings she had with her ex-boyfriend, Tasuku. She holds a very quixotically weak grip on the difference between fantasy and reality. For example, she believes Canti to be the manifestation of Cantido, the Fire Starter video game god to whom she burns things as sacrifices. She also emanates an aura of benign vapidness that causes much of the cast to look upon her with disdain. Her speech suggests stupidity and her actions naïveté, such as when she believes (and continues to believe) that "Canti-sama" is a god based on the simple fact that he has wings. Mamimi can be seen as lacking control over her life or willpower, hence the near-constant smoking and child-like reliance on others, whether it's Naota or his brother, Tasuku. In fact, Mamimi can be exceedingly destructive - although only when nobody is watching. She is hinted at being the cause of many fires started under mysterious circumstances that become part of Mabase's rumor mill. Naota confirms this by connecting her love of Fire Starter and Cantido, sacrifices, and smoking to the burning down of her old school years ago. That was also the incident that started her obsession with Tasuku, who she recalls saving her in a very romanticized fashion.

Mamimi often has a very difficult time accepting changes in her life such as when she heard about Tasuku's American girlfriend and as a result had a mental breakdown which she called an "overflow". Another example is when Naota began to develop into his own person, and she responded by becoming aloof around him. When Naota cut ties with Mamimi her mental health further deteriorated as Mamimi went after people on her "revenge list" by going after the cellphones and then the vehicles of everyone who ever picked on her. She did this by feeding them to the terminal core who she adopted as a "pet" not realizing it was merely using her and in her unstable state of mind, Mamimi could not fully grasp the repercussions of her foolish deeds as the core went out of control. After Atomsk left earth, Mamimi finally realized Tasuku was never coming back for her, and she just needed to move on with her life, which is why she left Mabase but not before she made amends with Natoa by calling him by his real name, showing her remorse of how she acted.