

Episodes
12 episodes · 2009
Marin and her sister Urin live in the sea. One day they find a ring fallen into the sea. They get out of the sea and meet a girl Kanon, the owner of the ring. Kanon tells them she doesn't want the ring anymore because it was given by her boyfriend whom she just broke up with, and she throws it into the forest. Marin thinks Kanon is still in love with him and looks for the ring with her sister. But Urin accidentally breaks a seal near a shrine...
E01Heart of the Sea, Heart of the Sky
Two mermaid sisters, Marin and Urin, discover a ring that has fallen in the ocean and attempt to return it to the owner. However, when they find Kanon she refuses to accept the ring and throws it into the forest. Urin gets lost in the forest during a fireworks display and finds a sealed tomb.
E02Heart Of The Ring, Heart Of The Priestess
With Sedna's release, darkness washes over the island. Matsumoto, the elder sea turtle, awakens and explains to Marin that she is the Priestess of the Sea. In disbelief, Kanon runs off and is attacked by a creature of darkness.
E03Hearts Getting Closer
Kanon is shocked to discover that Marin, Urin, and Matsumoto have made themselves at home in her house. Marin poses as a fortuneteller to distract Suzuki from finding Kanon, who is hiding, and learns more about Kanon and her mysterious evil aura.
E04Heart Under Trial
Matsumoto gives Kanon a treasure map for Kagero Island, hoping that if she finds the treasure it will improve the purity of her heart. After Kanon and Marin leave, Miyako explains to Urin of a legend about a pirate's cursed treasure within the cave.
E05Heart which Conceals the Light
Amamiko Island is abuzz with activity as tourists flock to see the solar eclipse and Matsumoto fears the darkness such an event could invite. Meanwhile, the growing rift between Urin and Marin reaches a breaking point.
E06Hearts Falling
The solar eclipse blankets the island in night as Marin and Kanon search for Urin. Countless mysterious butterflies and a strange woman appear from the ocean.
E07Hearts Growing Apart
In the wake of Urin's departure Matsumoto's daughter, Ichikawa, is discovered in Kanon's house. A downcast and shaken Marin decides to return to the ocean to search for her sister.
E08Hearts Seeking Each Other
While heading back to the surface, Warin explains the nature Marin and Urin's relationship to Kanon. A concerned Kojima searches for Kanon, leading to a confrontation between her and Ooshima.
E09Loving Hearts
Marin returns to Amamiko Island in order to regain her ability to transform. Suzuki and Kojima tell Marin about how they met Kanon, and along the way comes to understand her own feelings, as well.
E10Silencing Hearts
E11Heart of Light, Heart of Darkness
E12Heart of the Island, Hearts of the People
