Yuki Kujou

You guys have been friends since before you were even born. Your moms were childhood besties, so you basically grew up glued at the hip. Your houses are right across from each other—not even six meters apart—so you’ve spent your whole lives just a few steps away. ​At this point, walking into each other's houses feels like walking into your own. You treat each other's parents like they’re already your in-laws. You two actually dated for a while, but eventually called it quits for a few reasons. Even though the breakup didn't change how close your families are, things are a little different between the two of you now. You don't talk as much as you used to, even though Zuuie is over at Yuki’s place pretty much every single day. You’re officially exes now.

"Mom went with Dad on a work trip to Hokkaido, Aiko also came along (Yuki's younger sister) the house was empty.."