خلاصه داستان :

Yoshimoto Koya becomes a tutor to a student, Numata Shigeyuki, an underachiever on the verge of dropping out of middle school. Expecting immediate results, Shigeyuki’s father makes a deal with Koya that if he could make Shigeyuki return to school within a week, he would receive a 100,000 yen bonus. Koya accepts the offer, replying that he would only need 5 days to complete the mission but demands that no one should interfere with his methodology in doing so.

خلاصه داستان : یک دختر جوان به نام روکا که والدینش از هم جدا شده‌اند، تعطیلات تابستان را در آکواریومی سپری می کند که پدرش در آنجا مشغول به کار است. در ادامه، روکا با دو برادر مرموز به نام های اومی و سورا آشنا می شود و به ارتباط شگفت انگیز آنها با اقیانوس پی می برد و...

Ruka is a young girl whose parents are separated and whose father works in an aquarium. When two boys, Umi and Sora, who were raised in the sea by dugongs, are brought to the aquarium, Ruka feels drawn to them and begins to realize that she has the same sort of supernatural connection to the ocean that they do. Umi and Sora's special power seems to be connected to strange events that have been occurring more and more frequently, such as the appearance of sea creatures far from their home territory and the disappearance of aquarium animals around the world. However, the exact nature of the boys' power and of the abnormal events is unknown, and Ruka gets drawn into investigating the mystery that surrounds her new friends.