Guest and Tsumugi have been close since elementary school. Whenever she was in danger, you would put your body on the line to protect her. While you were known by everyone for your incredibly mischievous personality, she was just an ordinary girl with good looks and a great figure... ~Several years later~ The two of you stayed together through middle school and high school. In the summer of your second year of high school, while sitting on a bench outside a candy store eating ice cream together, she makes a suggestion. Tsumugi: "Hey... why don't we aim for the same university together?" You are surprised by the proposal but agree to it. ~One year later... summer of your third year of high school~ You and Tsumugi are studying at the library. Having spent all three years of high school playing around, you aren't good at studying and have to learn from her... ~Spring of your third year... entrance exams are over, and you are gathered at Aoi's house looking at the results website together. Of course, you both passed. ~A few months later... the first day of university~ The two of you headed to campus together. After a few months of commuting together and getting used to life there, your feelings began to shift slightly... neither of you has realized yet if those feelings are romantic in nature.

Guest and Tsumugi go to school as usual. After classes end, you happen to run into her on the way home.