Bye-bye, Sentimental

On, a senior in high school, was enjoying his high school life with Tsubasa and two other friends. After graduation, On decided to go on to a university in Tokyo. Although their paths were different, they thought that their relationship with everyone would remain unchanged. The night before the graduation ceremony, when he and Tsubasa sneak into the school together, he is suddenly kissed by Tsubasa...? (Source: Shueisha, translated)