Initially, these characters not in battle will gain XP at 0.5 the rate of those in battle. Raising their Bond raises this rate by 0.1 each time.
How to raise Bond
The easiest way is in battle. For every battle they are present for, a party member will gain +5 Bond level.
You can also gain Bond by attending a Cabaret, with more Bond gained depending on how much money you spend on the event. However, this is a boy's only event, so Saeko will not attend.
These two events raise a character's Bond, but once they reach of the end of their Bond bar, they will get a lock symbol next to their Bond. This means they can no longer gain Bond, and are ready to level up. Speak to them in the Survive Bar to complete their level up.
How to raise Eri's Bond
Eri's Bond works slightly differently. Hers is tied to the Business Management minigame, meaning it rises in huge chunks each time your business performs well. Check out the guide for more info on exactly how that works.
What are the rewards for Max Bond?
At level 5, the character will gain a special duo move with Kasuga. These do Extreme damage and are amongst the strongest in the game. It is recommended that you have at least one Max Bond move to call upon for Chapter 14 & Chapter 15.
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