Haruma Kawagoe is an only child. A long time ago, at Christmas time, his mother miscarried the child that was to have been his baby sister. That night, young Haruma knelt down and offered up an earnest prayer: "Please make my mother well again, and please give me a little sister." Years have passed, and Haruma has nearly forgotten his prayer. But Santa hasn't.... one Christmas, when Haruma is least expecting it, he gets an unusual present - his sister.
Characters and Voice Actors:
- Main:
Choco
The little sister that Santa brought to Haruma. She is sweet and very innocent, all her knowledge of the world initially derived from an instruction manual she was given before her delivery to Haruma's home. Apparently the manual does not cover all situations and it is not really written for someone of Choco's level of experience. Some of the information is even quite inappropriate for someone of her age... Choco appears to be a sweet girl and is very fond of her new "onii-chan", as she immediately identified Haruma.
- Saitou, Momoko (Japanese)
Haruma Kawagoe
The main character, a young man who once spoke a prayer to God that his mother would recover after her miscarriage, as well as a wish to Santa that he would "stand in" for her and deliver him a little sister. Years after the wish, it was granted, leaving Haruma with a sudden addition to his household. He apparently cares a great deal for his new sister already and considers her to be extremely cute.
- Hirakawa, Daisuke (Japanese)
- Supporting:
Makoto Ashirai
A young woman who lives in Tsubaki manor, the same building that Haruma, Choco and Yasuoka inhabit. She sports orange hair, enjoys her liquor and teases Haruma with her (lack of) wardrobe and claims that he is interested in her body. Despite her apparent penchant for inebriation, her laziness, her tendency to mooch any and all kinds of food off her neighbors, her "adult" sense of humor and a somewhat scheming, manipulative nature, she seems to have a good character; she came to the original landlady's rescue after the latter took a spill down a staircase, spraining her ankle and waist. She has displayed a rather uncomfortable interest in Chitose's bust—uncomfortable to Chitose, that is. She is a model, however does not reveal it to those around her.
- Morinaga, Rika (Japanese)
Yurika "Yuri-pyon" Hanayamada
A young girl who appears to be younger than Choco. She is from a rich family and lives in a big house with a maid who tends to her. To live to her standards, she is often forced to take violin lessons, tutor, English conversation lessons, which she dislikes. During one of her attempts to escape her lessons, she met Choco and they became friends. Even though in the beginning, she did not really like Choco, she came to really care for Choco as they got to know each other better. However, Yurika is not good at showing her true feelings and often denies this. Also, Choco gave her a nickname, "Yuri-pyon", to which she objected at first but got used to. She has a crush on Kakeru but he is oblivious to her feelings.
- Kugimiya, Rie (Japanese)
Kakeru Ishida
A young boy apparently Choco's age, who seems to be slightly shy and unintentionally saves Choco from a nasty fall. He works in a public bath, apparently to help out since he lives there.
- Kobayashi, Yumiko (Japanese)
Tamami Marumo
Tamami is Haruma's upperclassman at school, and his senpai in a club he belongs to. She has a habit of getting Haruma and other students part-time jobs on very short notice.
- Matsuoka, Yuki (Japanese)
Midori
A mature woman who Choco first encounters in the public bath attended by Kakeru. She is apparently a woman of firm convictions amongst others about the proper way to behave in a public bath. She looks similar with "Santa" and is also a tough looking woman but she is not "Santa".
- Koyama, Yuka (Japanese)
Eriko Odawara
She performs the "Neko-nyan Dance" on tv.
- Saito, Chiwa (Japanese)
Chitose Serikawa
The granddaughter of the original landlady. A nice, but somewhat shy and accident-prone young woman who has no sense of direction and who holds feelings of insecurity due to having to wear glasses and discontent with her own looks; she suffered a painful episode in school when she overheard the boy she liked calling her "an ugly girl with glasses". Several characters have remarked upon the impressive size of her bust. She seems to have developed a crush on Haruma since he said her glasses became her very well.
- Mizuhashi, Kaori (Japanese)
Ayano Sonosaki
A woman who works in the Ciel blue de fleur (which seems misspelled early on in the anime—it should probably be the French "bleu" instead of the English "blue": "Blue heaven of flowers") near Tsabuki manor. Ayano's dream has apparently always been to open her own flower shop. Haruma has a crush on her, but has so far been unable to work up the nerve to do anything about it. It seems that she remains oblivious of Haruma's affections and sees him as no more than a good acquaintance. She was engaged to Kazuya until he broke it off, to her considerable sorrow.Ayano runs a small florist shop near where Haruma lives.
- Ohara, Sayaka (Japanese)
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