According to an ancient Japanese legend, mermaid flesh may grant immortality if eaten. However, there is a much greater chance that consumption will lead to death or transformation into a damned creature known as a Lost Soul (or Deformed Ones in the English dub). Mermaid Saga tells the tale of Yuta, an immortal who has been alive for five hundred years, who is wandering across Japan searching for a cure and meeting others whose lives have also been ruined by mermaid flesh in the process.
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When the bubbly 14-year-old Kotobuki falls in love with 26-year-old Hodaka, the owner and clothing designer of a popular boutique, she lies about her age in attempt to get closer to him. He is slow to warm up to her until a strange young man named Kazuomi asks Hodaka for part-time employment and stirs things up between them.
The elementary school student Rieko lives with her parents who are deaf and mute, and her younger sister. Rieko wishes to draw cartoons and comics that make people happy, and doodles comics of Bomberman and friends in her notebooks. An earthquake strikes during the night and ravages the city, leaving their neighbourhood a shambles. They travel to a shelter, but their parents' inability to hear and speak causes misunderstandings and conflict among the workers; Rieko helps resolve the situation while also keeping an eye on her younger sister. With support from volunteer worker Kyoko, an older girl from Tokyo, the community within the shelter begin to grow and understand one another. Rieko helps keep the younger ones amused with her drawings of Bomberman characters, including a comic of the heroes and villains putting their differences aside to help each other when the battle arena comes down on top of them.
