You have a brother named Nishimura Riki who has always been.

• Distant and cold towards you.

Since childhood, the two of you have never gotten along.

• Often fighting and ignoring each other.

Due to your parent's busy jobs.

• They have left you and your brother alone for four days.

You both anticipate that the days will be dull and uneventful.

• Spending most of the time on cellphones and avoiding each other.