In Monster Hunter Stories, you can get hearts back by participating in multiplayer battles and achieving high scores. Additionally, some side missions and achievements can grant you hearts as rewards. Another option is to craft or upgrade equipment that has the property of restoring hearts over time.
You can get hearts back by completing certain quests or defeating specific monsters. Sometimes, finding hidden treasures or interacting with NPCs can also give you hearts.
To regain hearts in Monster Hunter Stories, one way is to explore different areas and look for special items or resources that restore hearts. Another approach is to level up your character and unlock abilities that help with heart restoration. Also, keep an eye on the game's events and challenges as they might offer rewards including hearts.