All I know is that the character in the heart means double happiness and is mainly associated with marriage. They could also be found on gift items to the bride and groom.
THANK YOU TO WHOEVER UPLOADED THIS. literally throughout the years, I have always been wondering whether buddy go would update. BUT YES AND IT'S AN ACTUAL UPLOAD
THIS WAS SO CUTE AND HEARTWARMING. I NEED A SEQUELLLLL ┻┻︵ヽ(`Д´)ﾉ︵┻┻