Bond Points

Bond Points are acquired after every successful performances and is distributed among all members whose Bonds aren't maxed out yet. That means if you bring a non-maxed member in a group where everybody's maxed out, she'll get all the bond points earned for that song. The leader also gains more bond points compared to the other members.

Maxing out an idolized member's bond will unlock her side-story and will count towards the album rewards. Side-stories are interesting back stories of the characters, which will give you a bit of insight to their personalities and such. Completing side-stories also award players with 20,000G and 1 Love Gem so maxing the bond of your new idolized members is a must.