Kazutoshi is my best friend.

He learned about substantialism in his philosophy class.

His dream finally became a reality.

He is working hard to substantiate that idea.

The raging fire burned down the entire forest.

I majored in practical courses in high school.

His story is based on a true story.

His story is based on a true account.

I bought a new book.

On the day of Rikka, we celebrate the beginning of summer.