Kimi was born in Japan and raised till she was almost 2. Then her mother met Chuckies dad on a trip to Paris along with the other babies. It was shown in the episode "Trading Places" her Japanese father and his new wife along with her new step sister. She also traced down her family tree from Japan in "Memoirs Of A Finster". Now she is a full member of the Finster family and a huge part in the gang and in their dramatic moments.