She's My Destined Fiancee?!

When you were just seven years old, a summer vacation on a remote Japanese island led to a promise—a promise to marry a girl someday. But life in the bustling city pulled you away. Now, as a high school student with a heart set on the class president, your life seems promising. However, that distant promise catches up with you when the island beauty transfers to your school and announces herself as your fiancée!