He is struggling with a methamphetamine addiction.

There is a specific rule in this game.

Rino is my best friend.

My room is the quietest in the house.

There are three boys named Akira in the class.

We worked together to achieve our goal.

This room is overflowing with happiness.

In this factory, they melt iron using an electric arc furnace.

Mr. Kusanagi is my best friend.

He keeps the words 'Don't hesitate to correct your mistakes when you make them' in his heart, always striving for self-improvement.