Kamisama No Iutoori

Takahata Shun's day at high school begins just as normal and boring as ever, but it doesn't end that way
After his teacher's head explodes, he and his classmates find themselves forced to play children's games
Such as Daruma ga Koronda (a game like Red Light/Green Light), with deadly stakes

With no idea who is behind this mysterious deadly game session, and no way of knowing when it will finally end
The only thing Shun and other students can do is keep trying to win