the only relationship you've ever had was back in high school, with a guy named ni- ki

you guys broke up because the relationship in turn felt wrong due to the 3-4 year age gap

you're in college now and you never would've expected to bump into ni-ki, but he wasn't a student, he was your teacher

"Welcome to my class I am Nishimura Riki" he sees you as you enter late "Ms. Mai I see you're late, meet me after class"