DISCLAIMER: I DON'T OWN SAILOR MOON! NAOKO TAKEUCHI AND TOEI ANIMATION DO THOUGH, SO DON'T SUE ME! I'M JUST A POOR HIGH SCHOOL STUDENT! CHECKS BANK ACCOUNT OH NO! I ONLY HAVE $0.05! HOW CAN FATE HAVE DEALT ME A CRUEL HAND? OH, RIGHT, MY FRIEND'S DAD HAPPENS TO BE A WELL-KNOWN RACE CAR DRIVER AND HAS MORE MONEY NOW THAN ANY OF YOU WILL HAVE IN A LIFETIME! NOW DON'T SUE ME!

CHAPTER TWO
Umino was finishing telling the girls about Chibiusa (Rini's) mother. To answer your question Chibiusa, Naru is my wife and was your mom's best friend.