Life is like a ladder. You just have to keep going up. Otherwise, if you start to think, it will be difficult for you to take the next step.
Shinichi wants nothing but a quiet life. Although he was once a close friend of Miyuki, the most popular girl in school, his desire for a normal life prevents them from being anything more than classmates.
But everything changes when, one day on the rooftop, class freak, Aoi, suddenly tries to kiss him. Miyuki appears just in time to stop her, but after that Shinichi feels the urge to let light into the eyes of this lonely girl. He turns to Miyuki for help, and soon a trio of them is born.
As the days go by, Aoi gradually learns what it is like to be friends. But at the same time, long-extinct feelings awaken in Miyuki's heart. As the distance between her and Shinichi narrows, the blood ties of the three friends begin to break down.
Miyuki or Aoi - when the time comes, who will Shinichi choose?