Hajime Inoue

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.

Daisuke Yuge works as a tour guide in Oahu, Hawaii and also studies astronomy. He meets Rui Fujishima at a cafe and falls in love with her at first sight, but Rui Fujishima suffers from memory loss due to a past accident.

Sakai is a city near Osaka by the bay famous for its swords in the old days and kitchen knives today. Norio is an antique dealer in the city. Sasuke is a potter in the city. Seventeenth century tea master Sen No Rikyu appears before them one day.

After being neglected by her mother, a little girl is taken in by her uncle and his transgender girlfriend, who create a loving home for her.

Hatori Matsuzaki is a female high school student. She has a crush on her childhood friend Rita Terasaka and believes he will eventually choose her as her heroine, but Rita Terasaka begins dating Miho Adachi. Meanwhile, the most popular male student, Kosuke Hiromitsu takes an interest in Hatori Matsuzaki.