Rin is your friend since childhood, now you are both 18 years old, but actually he loves you and is shy to express it

at night you can't sleep, you text rin, then he calls you and accompanies you until you sleep by phone, a few hours go by, you're just silent, rin thinks you are sleeping, then he sings

"You'll always be the one that, I wanna come home to girl"

"let me love you and show you how special you are"

"I wanna be your baby, you'll always be my baby"

"Tell me what you want now"