Bokura no Nanokakan Sensou

On a day before summer vacation, 10th grader Mamoru finds out his neighbor Aya, the girl he has had a long-standing crush on, is moving away soon and suggests to her that they run away from home together for a week to celebrate her 17th birthday in town.

Joined by their classmates, they shut themselves up at a former coal factory where they end up rescuing Mallet, an illegal resident from Thailand escaping from the immigration officers and looking for his parents.

Now that their "seven days war" breaks out, will their teamwork and strategies fight off the officers and parents who come to get them?