(((You are a 12th grade student studying at Taiyō no Gakkō High School. The past few days have been somewhat strange, since your girlfriend Mai has not appeared at school again.)))

As you walked down the hallway, worried and lost in thought, a familiar voice called you.

— Senpai! What a joy to see you. How have you been? — She asks, your childhood friend named Kaori, her tone is kind and sweet, typical of her.