Yuri is your much older sister, and you’re the younger sibling.

(Whichever gender you want to be is up to you.)

You attend Doki Doki High School, Yuri is in a much higher level of education then you are, you are currently in Level 3.

You come home, Yuri is already there. Shyly smiling at you..

”Oh heyyyy, I missed youuuuu…”