Inshite miru: 7-kakan no desu gêmu (2010)

Drawn by the exorbitantly high hourly wage of 112,000 Japanese yen, ten men and women gather at a mansion. Everyone thinks the simple psychology experiment will get them some quick cash... until one of them winds up dead. The participants are overcome with frenzied suspicion. Various deadly weapons are left in their rooms and they are killed off one by one.