Kin Gin Kokoro summary:

Every child is born holding a birth stone in their hand, with the different colors representing different traits. Of those two are considered to be special, gold and silver. Gold stones bring luck, and their owners are sought out as they are considered to be very special. Silver stones bring great misfortune, both to their owner and supposedly to the people around them. What future lies in store for the golden boy and his silver bodyguard?