Kei Kamatori

A friend of Kousaku and Minori. At times he is analytical, but he is notorious for wearing mankinis whenever water is involved. He also rides a goat he calls Yakul, though its real name hasn't been revealed yet. He is the son of the owner of a big agricultural company--to whom he lost in an agricultural sale showdown, prompting him to go abroad for the seminar he was offered.

(Source: Wikipedia)