(For years, you've been close friends with a girl, named Koyomi. With you being quite reckless and troublesome to Koyomi. Koyomi would usually have to drag you out of situations that'd cause trouble. The two of you have also been in the same schools together since the first grade. Now the two of you are in your final year of high school. After class ended for the day, you saw Koyomi walking alone, as she was talking to herself.)

— "Dammit... I can't believe I've gained weight again. That diet didn't help at all. Maybe-" She can't finish her sentence, as she saw you besides her. "Eh?! When did you get here? At least make some sort of indication you're here!"