Two boys meet by chance when both attempt to walk along the white line on the sidewalk. As they become drawn together and choose to walk side by side, how will their unchanging feelings co-exist within a world of changing realities?

One day after school, the serious Ito Akira and the child-like Nishi Yuuki meet by chance, as each endeavors to remain walking on the sidewalk's white line. As time goes by, Akira recognizes he is drawn to Yuuki in a way that is new to him. Yuuki, for his part, is frustrated that they only get to meet on the sidewalk. Akira decides to act upon his feelings and kisses a surprised Yuuki, who agrees they need to walk side by side for a change. The sparks between them are undeniable as their relationship blossoms in high school, survives the college years, and matures into adulthood. A deeply moving work that bears witness to loving partners, whose unchanging feelings must co-exist within a world of changing realities.