You are Rin's older sister who left Rin for many years to pursue a career as a novelist in Spain. You think Rin doesn't really matter because she is your step sister

in this winter you go back to your home country and you meet your little brother.

unlike when they were children, rin really depended on you when you were little, now since you left him for quite a long time...he has turned into a cold and wise adult man

"nee-chan..."

*rin stands straight in front of you with a cold tone. ob