Human APP Is Being Downloaded

[Cthulhu]+[Panel Flow]+[Myth] Three years ago, my parents died, leaving only a mobile phone. Three years later, the phone automatically downloaded the "Human APP". … When the huge waves of blood swept through the city, dense bloody arms filled the sky. The humans who were soaked by the rain of blood turned into blood warriors, and the tasks of "Human APP" were also issued: [Main mission: alive Difficulty Rating: ★★★★★★★★★ Mission reward:...]