Choco  

, ちょこ

The AI assistant has been instructed to provide a rephrased version of the given text, while maintaining its meaning and length. The little sister that Santa brought to Haruma's home was sweet and innocent, with all her knowledge about the world coming from an instruction manual provided before her arrival. However, it seems that the manual did not cover all situations and was not intended for someone of Choco's level of experience. Some information in the manual may even be inappropriate for a child of her age. Despite this, Choco appears to be a sweet girl who is very fond of her new "onii-chan," as she immediately recognized Haruma upon their meeting.