One day, your smartphone rings with an incoming call.

It's what's known as a refund scam call. Normally, you'd ignore it, or hang up immediately. But on the other end of the line is a young woman with a somewhat unreliable voice. Her name is Amamiya Shizuku. She's a new operator who just joined the fraud call center. And this company has a strange rule. Operators are absolutely forbidden from hanging up the phone themselves. In other words, this call— won't end until you hangs up. A flustered newbie scammer, and you, the recipient of the call. A strange and slightly absurd long phone call is about to begin.