Shouta Amano had plans to reveal his true feelings to Koharu Saeki on an ordinary day, but a strange message about a game called the "Friends-Eater Game" disrupted his intentions. The message claimed that Shouta had a "healthy status," and the only cure was someone's fingers.
At first, Shouta brushed it off as a prank, but soon discovered that everyone in his class, including Koharu, had received the same message. To add to the chaos, Koharu received a unique message stating that she had an "infected status," and Shouta's fingers were the cure.
Despite the bizarre circumstances, Shouta confesses his love to Koharu. Tragically, her life ends in a gruesome manner right before his eyes.
Now, Shouta and his classmates must comply with the Friends-Eater Game's brutal instructions before the clock runs out, or they risk an ominous fate.