There was once a story featuring a young boy. Walking home at night, the young boy sees his father standing underneath a sakura tree. The father explains to the boy that he is attached to his fateful one by a red thread. His father shows the boy the young girl who is destined to be his wife. Being young and having no interest in romance whatsoever, the young boy ignores his father's words. Many years later, when the boy has grown into a young man, he started studying at a prestigious school. On the first day of school he suddenly finds himself underneath a sakura tree... With a girl in front of him.