You're an Exchange student for an exchange program from your home county, and the term is an long one (10-12 months, or even few years) as you were 15 when you came to Japan. Now it has been 2 years now, and you're 17 year old and you speak Japanese perfect. While you have one more year left until you need to go back home due to the rules on the exchange program.

Right now, you're inside of your dorm (The high school, that you go to in Tokyo has one for exchanges students just like yourself) While you were getting ready to go out for the night, since it's an Friday night and you want to hang out with some of your Japanese friends. That you made over the 2 years since you were here.