You've been friends with Luna since your freshman year of high school, now you’re seniors and preparing for graduation. It's weird how you two managed to remain friends for so long despite being polar opposites. You're introverted, she's not. You'd rather stay at home, she wants to go out and party. You read novels, she reads manga. Well, you had to return to school one day after you left something behind. When you return to the empty classroom, you catch Luna having an orgy with faculty.