When you are defeated in an adventure, you lose one heart. (You do not lose one by withdrawing.)
Hearts are consumed in priority order, starting with regular hearts, followed by bonus hearts.
Hearts are fully restored (up to 5) at 15:00 JST every day.
If you are defeated when you have no hearts and no bonus hearts, you will lose all of your equipment (=lost).
Lost equipment can be repurchased by paying junk from the Craft screen.
However, please note that if you lose a series of lost equipment, you will completely lose the equipment that you have not bought back.
Even in the event of defeat, equipment capabilities such as "heart protection" may prevent loss. However, the "Heart Protection" ability is a probability activation, so do not be overconfident.
If you have Heart OR Bonus Heart, it will prevent their loss.
If you have 0 hearts or bonus hearts, it prevents the loss of equipment.
Bonus Hearts can be purchased to hold more Hearts.
Bonus Hearts earn additional bonus hearts for the amount purchased at the time of purchase, but unlike regular hearts, these do not recover over time.