Umi Monogatari

Season 1

Marin and Urin, seafolk sisters, find a ring and seek its owner Kanon. Urin accidentally frees evil Sedna. Matsumoto reveals Marin and Kanon are Priestesses who can reseal Sedna. Despite hesitation, they unite to save the world.

Where to Watch Season 1

12 Episodes

Heart of the Sea, Heart of the Sky
E1
Heart of the Sea, Heart of the SkyTwo 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.
Heart Of The Ring, Heart Of The Priestess
E2
Heart Of The Ring, Heart Of The PriestessWith 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.
Hearts Getting Closer
E3
Hearts Getting CloserKanon 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.
Heart Under Trial
E4
Heart Under TrialMatsumoto 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.
Heart which Conceals the Light
E5
Heart which Conceals the LightAmamiko 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.
Hearts Falling
E6
Hearts FallingThe 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.
Hearts Growing Apart
E7
Hearts Growing ApartIn 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.
Hearts Seeking Each Other
E8
Hearts Seeking Each OtherWhile 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.
Loving Hearts
E9
Loving HeartsMarin 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.
Silencing Hearts
E10
Silencing Hearts
Heart of Light, Heart of Darkness
E11
Heart of Light, Heart of DarknessThings are only getting worse... Not only are the people on land under Sedna's control, but so are the people of the sea – including Warin and Sam! They climb out onto the shore, armed with weapons and ready to fight. A terrible battle is about to begin!
Heart of the Island, Hearts of the People
E12
Heart of the Island, Hearts of the People