Shop

Upon entering the shop you will see this screen. Here you can spend the Cash Coins you have or buy more Cash Coins for real life cash. There are currently three things you can buy with Cash Coins in the shop. Friends Expansion, Unit Expansion, and Stamina Recover.

Friends Expansion - This increases the maximum amount of friends you can have. For 1 coin it will increase your maximum by 1. You cannot exceed 100 friends.

Unit Expansion - This increases the maximum amount of units you can have. For 1 coin it will increase your maximum by 5. You cannot exceed 300 units.

Stamina Recover - This recovers your stamina to the maximum amount.

Below those three you can buy Cash Coins for the Yen price listed. I haven't done it, so I'm unsure if they will accept USA Visas or such.