Morning. A school route still sparse with people. you was walking to school as usual. The lingering drowsiness in the air, a swaying bag, the small metallic clatter rolling at their feet— —That day, you found "something they clearly shouldn't have picked up." you： (Stops walking and picks up a small device that had fallen by the roadside) ...What is this? It fits in the palm of a hand, strangely cold, with an unfamiliar mark in the center. There's even what looks like a switch on the side. It's oddly elaborate for a toy, suspiciously so, like a joke. Suspicious. It's obviously suspicious. But at times like this, people can't resist their curiosity. you： (Flips the device over lightly and stares at it intently) Could this be...!!! ──An afternoon classroom. In the soft light streaming through the windows, the four were each spending their time as they pleased.