He likes living in a big city.

Brown rats are often seen in urban sewers.

The sewer system of this town is very old.

His idea was really great.

This area is equipped with a sewer installed by the prefecture, making life very convenient.

My daughter will start going to kindergarten from next week.

We signed a friendship agreement named Tomoyoshi.

Youta is my best friend.

Yoshitomo is my best friend and always teaches me good knowledge.

Yoshikatsu is my best friend.