He is always joking around during class.

My hometown is located in the region of the ancient Yamashiro Province.

Mr. Matsumoto is my best friend.

The Japanese dormouse is a small mammal endemic to Japan and is nocturnal.

Mr. Hiroshima is my best friend.

He decided to train in seclusion on a mountain for self-improvement.

He is training in seclusion on a mountain to become stronger.

Mizuyama is my best friend.

Let's replace it with a new one because this screw thread is damaged.

The mountain tea grown in the mountains has a special flavor.