DokiDoki Syncing Unrequited crush backup

This girl is all "Doki Doki" (heart-pounding), thinking she's magically "syncing" with this guy, like it's destiny. But he's kind of a sadist who just threatens her, saying "you'll lose your backup." She's mistaking her actual heartbeat for a data sync. She finally realizes it's totally one-sided-she wasn't his soulmate, she was just his backup plan.