Kenpei is my best friend.

She likes tuning the koto in the most common method, hirachoshi, the best.

Ryohei is my best friend.

Teppei is my best friend.

A straight angle is 180 degrees.

I watched the Olympics in Pyeongchang.

I watched the Olympics in Pyeongchang.

According to the traditional Japanese calendar, what is today's date?

In math class, we learned about the concept of union.

Kazutoshi is my best friend.