All the human soul is the sea a huge fish, was born when starting from the sea shore, on the road, sometimes meet, sometimes separately, die when going to the sea shore, later turned into a a sleeping fish, after waiting for many years starting again, this journey forever will not end, life reciprocating endless [3]. Sixteenth birthday that day, living in "God around the floor in a called" Chun "girl became a dolphin to the world tour, see they are in charge of the laws of nature, accidentally trapped a net in the sea, a human boy because save her and fall into the sea dead. In order to pay a debt of gratitude, to revive the human boy, TSUBAKI need in a world of his own, after various difficulties and obstacles and help after the death of the boy's soul -- a thumb so big fish, the growth of a more enormous than the whale fish and return to earth所有人类的灵魂都是海里一条巨大的鱼，出生的时候从海的此岸出发，在路途中，有时相遇，有时分开，死的时候去到海的彼岸，之后变成一条沉睡的小鱼，等待多年后的再次出发，这个旅程永远不会结束，生命往复不息[3] 。十六岁生日那天，居住在“神之围楼”里的一个名叫“椿”的女孩变作一条
海豚到人间巡视，查看他们所掌管的
自然规律，意外被大海中的一张网给困住，一个人类男孩因为救她而落入深海死去。为了报恩、为了让人类男孩复活，椿需要在自己的世界里，历经种种困难与阻碍，帮助死后男孩的灵魂——一条拇指那么大的小鱼，成长为一条比鲸更巨大的鱼并回归人间