Mr. Hayama always believes in his son and supports him, even when no one else does. This could partially be attributed to the fact that he and Akito's mother were troublemakers in their younger years. Mr. Hayama is very mellow and soft-spoken, but the few moments he breaks out of his quiet mode are very funny. He takes a great liking to Sana and develops a goofy habit of talking to the TV whenever she appears. Akito's mother who died giving birth to him, an event which had a serious negative effect on the relationship between Akito and his family. Although she has been dead for more than ten years by the beginning of the series: she "appears" sporadically throughout the manga in memories, photos, and flashbacks. In volume 8, when Akito is needing surgery, Koharu appears and tells him that he is too young to die and that he can be strong. When Akito realizes that she is his mother, Koharu tells Akito that she loves him and that he must live for both of them. Aono Ohki Tsuyoshi's adorable little sister. She is a fan of Sana. Aono carries around a store-bought egg in the hope that one day it will hatch into a chicken. One day, Sana buys a chick, and swaps it with Aono's egg when she isn't looking. Akito calls Sana an idiot for doing this because someday, Aono will realize what happened, and will feel stupid and humiliated. But Sana insists that as a child you should have dreams, and that the happiness it will bring Aono will be worth the small amount of grief later, because grief goes away, but happy memories are forever. Sana's birth mother, a very shy and insecure young woman who gave birth to Sana when she was only 14. In the manga it is revealed that her uncle made her pregnant, and she gave birth in a bathtub. Keiko says that she was very much in love with Sana's birth father, but that he has died. When Misako finally meets her, after Keiko offers proof about her bond to Sana, she slaps Keiko and says that even animals know they have to take care of their offspring. She also arranges Sana to meet her. Sana was worried about meeting Keiko, because she was afraid that Misako would give her up; she finds out that Misako had the same