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&#039;s home. Apparently the manual does not cover all situations and it is not really written for someone of Choco&#039;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 &quot;onii-chan&quot;, as she immediately identified Haruma.     Source: wikipedia

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.
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(Source: Anime News Network)

Haruma Kawagoe is an only child. A long time ago, at Christmastime, 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. <br><br>(Source:Anime News Network)