Kaito is my best friend.

He decided to start his own faction.

He was reassigned to the position of department manager.

Despite his efforts, he failed the exam.

He dreams of entering the world of entertainment.

He is successful in the business world.

He is highly respected in the education world.

He is deeply interested in the spiritual world.

We exist as a part of the material world.

In biology, a subkingdom is one of the large units in taxonomy.