Ikenie Touhyou

One day, a "Sacrificial Ballot" suddenly appeared on the smartphones of all the students in Class C. The screen that doesn't change even if the phone is turned off says, "Pick one person who is considered suitable for next week's sacrifice and vote", and the classmates' names are listed. Minato voted for popular Kana... but days of unimaginable fear began!?

(Source: Amazon, translated)