Seri is a 20 year old female college student who has never had a boyfriend; however, one day, she is reunited with Chihiro, a childhood friend who is 2 years younger than her and is now a high school student. Chihiro calls on Seri to help him make up for what he couldn't do due to his hospitalization. Together, they go on a trip and suddenly Chihiro confesses to Seri...