Ryo is the game currency of TheNinja-RPG.
There are a number of ways to earn ryo.
As the name suggests, it's a bank to keep your ryo safe. (This means outlaws can't get to it) Store ryo in it and use it to send ryo to others. Do note there is a cap to this. The ryo cap is 200 million total, including both your pocket and bank. Outlaws cannot access the bank, they hide their ryo in the Ground. However, whenever you join or leave a village, your ryo is automatically transferred, so you don't have to worry about it.
From the item shop, you can buy armor, weapons, and various items with different purposes, including food and soldier pills to recover HP in battle.
The ramen shop is the easiest way for a villager to recover their own HP. Using ryo, you can buy ramen of various sizes from the ramen shop. The bigger the ramen order, the more HP you'll recover.
When you lose a battle, you are hospitalized. When this happens you must either wait 15 minutes for your body to recover, or bribe the doctors to heal you immediately. You can bribe the doctors using ryo. The higher your maximum HP is, the more expensive your hospital bill will be. You can lower the cost of bribing the doctor by having Village Loyalty, after 170 days and 250 days. There is also a small percent chance that your Village doctors will instantly heal you for free.
All jutsu except forbidden jutsu require ryo to train at every level. The costs also go up every level!
You can also use ryo to undergo surgery, which will drastically increase your maximum HP. The higher your maximum HP is, the more expensive your surgery bill will be.
Items may also be obtained from other players through the trade system with ryo.