Mr. Kaiboku is my best friend.

When summer vacation comes, I go to the sea every day wearing swim trunks.

You can see drift ice in the Sea of Okhotsk in winter.

He was standing on the seashore, staring at the distant horizon.

He gained sailing experience in the Arabian Sea.

I have visited the Coral Sea.

I cooked today's dinner using fresh fruits of the sea.

In order to survive in this ever-changing world, it is necessary to constantly continue learning new knowledge.

Kaisago is my best friend.

Kaisa is my best friend.