Normally, you lose one heart when you are defeated in an adventure.
Hearts are naturally recovered every 24 hours, but if you are defeated with no hearts left, you will lose (=lost) all of your equipment.
(You can buy back up to the last one lost through the "Craft" function.) If you have bonus hearts, you will be given a grace period of hearts until you lose your equipment.
Bonus hearts can be purchased on this screen.
Please purchase the quantity you need.
You will receive additional Bonus Hearts for the amount purchased, but unlike regular Hearts, these will not be recovered over time.
This is the only item that is not used up, but is permanent.
After purchase, you will no longer consume hearts.
If you purchase this feature, you will not be able to switch to a non-infinite state.