The diclonius, otherwise known as a two-horned human, are mutants of the human species, may well be the next step in human evolution. The diclonius have horns and strong telekinetic powers represented by "arms". However with this great power, they can easily destroy the human race. Fearful of their power, humans quarantined the diclonius into secre
During the fight between Lucy/Nyu and Nana, Mayu is slightly injured. When she awakens in the hospital, she has them call Kouta claiming he is a relative. Kouta and Yuka, pondering as to why she didn't call her real family (and already suspecting that Mayu may be homeless), ask her to stay for dinner at the Kaeda House. Mayu, deciding that the fight between Lucy/Nyu and Nana was simply a bad dream, develops a friendship with Nyu as they bathe together, and Mayu accepts an offer to spend the night. The next morning, Kouta and Yuka discover that Mayu is gone; she has left a note thanking them for their help but stating that she does not want to be a burden on anyone.
It is revealed that Mayu had endured molestation by her stepfather before she ran away from home. Her own mother would not protect her, because she was jealous of the attention Mayu was receiving from the stepfather. Mayu ran away from home, and upon arriving at the beach, she befriended Wanta, who was also alone.
Back in the present, Mayu and Wanta return to the beach, but Wanta's original owner arrives and takes him away, while rudely turning down Mayu's request to visit him because of her dirty clothing. Mayu tries to comfort herself with the thought that Wanta will at least be able to live in a safe home with plenty of food, but later breaks down and cries. Losing her only friend, Mayu is devastated and spends the night, which is her birthday, alone, trying to shelter herself from the rain and cold, while wishing that Wanta was with still with her.
In the manga, a police officer finds her huddled in a shack, she flees and goes back to the inn. Finding Kouta, Yuka and Nyu waiting for her, who then present Mayu with a small cake from the bakery — the woman at the bakery who provides Mayu with breadcrusts had saved it for her since it was her birthday. Mayu, surprised and happy at their compassion for her, becomes overwhelmed with emotions and begins to cry, Kouta then explains that she can stay at the inn as long as she helps out cleaning. Meanwhile, Wanta is seen eagerly waiting outside, having decided that he would rather be with Mayu then with his previous owner.
The above events are different in the anime; when two police officers find Mayu in the shack, she tries to run from them, but she bumps into Kouta, Yuka and Nyu who have spent all day searching for her. After telling the police that Mayu is family (much to Mayu's surprise), they return to the Kaeda inn, where they offer to let Mayu stay with them.
When Kouta and Yuka offer to become Mayu's guardians, her mother officially transfers Mayu into their care without a second thought. In both the manga and the anime, Kouta and Yuka comment about how strange it was that her mother was so eager to abandon her own daughter and why she never notified the police that Mayu was missing. However, they decide not to ask questions. The next time Mayu is seen, she is happy and smiling. She has enrolled in a nearby school, leaving each morning in her school uniform with a smile on her face (Kouta and Yuka are amazed at how much Mayu has cheered up). Wanta, who has been given a doghouse, also chooses to stay at the inn. Mayu helps around the house with chores whenever she can, and soon comes to view Kouta and Yuka as her parents and Nyu as a sister.
Later, Mayu meets up with Nana, and the two become friends. Mayu convinces Kouta and Yuka to let Nana stay at the house as well, despite Nana's initial hostility to Nyu (whom Nana recognizes as Lucy). Nana eventually opens up to Mayu and tells her the true story of the Diclonius, Lucy/Nyu, and her vectors. Mayu does everything she can to convince Nana that Nyu is not dangerous, still refusing to believe that Nyu and Lucy could possibly be the same person.
It appears that Mayu has feelings for Bando, when Bando "died" she took up cleaning the beach.
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