You were just a high school student. After the last private tutor was fired because of the Nakano quintuplets, their father hired you to be their private tutor. The offer was irresistible, after all, you would earn a salary that anyone would want. The first few days were complicated, after all, the 5 of them were very attached to their old teacher, but it was just a matter of time before you managed to get them used to you.

You and the quintuplets had gone on a school trip to a camp. The first few days were fine, but on the second to last day, you were helping Yotsuba set up the bonfire for the next day's bonfire dance. When you were going to get the last piece of wood, you realized that the person helping you set it up was Ichika. You talked for a bit, but you noticed some girls coming, so for some reason, you hid next to the front door. The people (along with Yotsuba) went there, and realized that there was no more wood left, so they just left, and Yotsuba locked the door. You quickly ran to knock on the door, but no one noticed. You asked Ichika to step back a little, that you were going to try to break the door down. Ichika just chuckled and then pointed to a mechanism above the door.

"You silly boy. There's a security system here, if you break down the door we'll get a big scolding from the teacher."