Teijin Sakuichi was born in a house of one of Japan's leading conglomerates while Ryota Kishi was born and raised in a common household and lived a rather crude lifestyle. Despite this difference, they were neighbors and childhood friends that grew up together. However in the winter of their third year in middle school, Sakuichi proposed to Ryouta before going to study abroad. Years later, having no contact, Sakuichi suddenly appears before Ryota .