Family Rivalry Killing Battle

Masahiko Mariyama, a small-time businessman, lives a modest life with his wife, two children, and dementia-stricken mother. Then one day, the people disappeared from the town!
In the midst of his confusion, he is summoned to a place where he finds seven families and giant dolls. And so begins a compulsory recreational activity. No one is allowed to escape, and the winner will receive a luxurious prize, while the last place winner will be punished.