One summer vacation, Ruka meets two boys, "Umi" and "Sora," whose upbringing contains strange and wonderful secrets. Drawn to their beautiful swimming, almost more like flying, Ruka and the adults who know them are intertwined in a complex mesh... 
Meanwhile, an unexplained anomaly is occurring all over the world: fish are disappearing. Thus begins a marine adventure of boys and girls to captivate all the senses!

Yuu Aoi is a Japanese actress and model. She made her film debut as Shiori Tsuda in Shunji Iwai's 2001 film All About Lily Chou-Chou. She subsequently portrayed Tetsuko Arisugawa in Hana and Alice (2004), also directed by Iwai, Kimiko Tanigawa in the hula dancing film Hula Girls and Hagumi Hanamoto in the 2006 live-action adaptation of the popular Honey and Clover manga series.

She has won numerous awards for her performances on screen, including the prestigious Japan Academy Prize and Kinema Junpo Awards for Best Supporting Actress in 2007 for Hula Girls and Rookie of the Year for continued performances in the field of Films in Media and Fine Arts by the Ministry of Education, Culture, Sports, Science and Technology of Japan in 2009.

An American stage, television, and voice actress who has provided English language voices for Japanese anime shows, animation, and video games. Some of her major roles are Kallen Stadtfeld in the Code Geass series, Miyuki Takara in Lucky Star, Nina Fortner in Monster, Rider in Studio Deen's Fate/stay night, Suigintou the first Rozen Maiden doll in Rozen Maiden, Sawako Yamanaka in K-On!, Sola-Ui Nuada-Re Sophia-Ri in Fate/Zero, and Momo Hinamori and Soi Fon in Bleach.

In live-action productions, she portrayed Jolene in the television show Weeds.

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When Ruka was younger, she saw a ghost in the water at the aquarium where her dad works. Now she feels drawn toward the aquarium and the two mysterious boys she meets there, Umi and Sora. They were raised by dugongs and hear the same strange calls from the sea as she does.
 
Ruka's dad and the other adults who work at the aquarium are only distantly aware of what the children are experiencing as they get caught up in the mystery of the worldwide disappearance of the oceans' fish.
 
(Source: Viz Media)

Kanako Azumi