The Whale Constellation - Magmell Shinkai Suizokuan, Vol. 10

Minato Ousezaki, a brilliant loner, has just transferred to The School of Marine Science and Technology. One evening, a new acquaintance shows him Cetus, the Whale Constellation, saying, "you're like a lost whale that wandered into the bay." That night, Minato dreams he is a whale drifting to the bottom of the sea.