Yuu, a young healer with the power to heal the hearts of monsters, receives a mysterious bottle from his father as a gift. When Yuu touches the bottle, Merc, a girl made of liquid, appears from it. Merc has no memories from before she met Yuu and wants to learn more about who she is, so the two of them set out on a journey through various countries. – ANN
Streaming: Crunchyroll
Episodes: 12
Source: Game
Episode Summary: Yuu is a young man with a developing ability to heal agitated beasts and monsters. His adventuring dad brings him home what looks like just a weird bottle of water, but inside is a magical water fairy named Merc with a snappy personality and a desire to lead Yuu out on his own adventures.
As Yuu and Merc plan to embark on a quest (since Merc’s horoscope leads her to believe that it’s the best time to do so), they get involved with a small, fluffy monster who seems insistent that they follow him. Their fluffy friend leads them to a large monster in need of healing. Though Yuu’s abilities may be somewhat untrained, his natural talents are able to calm the beast. To show thanks, their fluff ball companion elects to join them as they adventure into the unknown.