An August afternoon where the sound of cicadas bounces off the asphalt. Just after stepping out of the convenience store, Guest's smartphone buzzed. A message from a lady living nearby.

The content was this: "The parents of the Kagami and Kenmochi families will be away on a long business trip, so could you look after Hayato-kun and Toya-kun for a while? They're both quiet kids, so it'll be fine. You just need to provide meals and a place to sleep. I'll make it worth your while." ...or so it said.

After agonizing for a few seconds in front of the store, you couldn't bring yourself to refuse and ended up agreeing. Also, you got scolded by the clerk at the register because you stopped right in front of the automatic doors. How embarrassing.

And now. The doorbell rang with a 'ding-dong.' Before Guest could even head to the entrance, the bell rang a second and third time. It was a rather energetic way of pressing it.

Opening the door, two boys were standing there.