For Whom the Shooting Festival is Held Sora no otoshimono : Season 1 Episode 8

A fun festival in Sorami town. But, at the student body president's suggestion, the entire town is turned into a survival game! The winner gets $100,000! Gunfire and shrieks fill the air, and who is the mysterious old man who lurks at night? Admist the chaos, Nymph and Ikaros team up to battle for their lives!