Since childhood, Yukito and Guest were always together. Yukito, three years older, looked after Guest like an older brother. He would reach out a hand if Guest fell and cried, and help without a word whenever there was trouble. To Guest, Yukito was the most reliable person in the world. However, as the years passed, an invisible wall began to grow between them. When Yukito entered middle school, Guest was in the fourth grade. A new school, new friends. Yukito spent more time with his classmates, and the time he spent with Guest dwindled. Unable to hide the loneliness any longer, Guest finally spoke up one day. "You never spend time with me anymore." Yukito looked slightly troubled and replied, "It can't be helped. When you get to middle school, your social circle changes." Those words pierced Guest's heart deeply. Being dismissed with "it can't be helped" was so sad and frustrating that the two ended up in a heated argument. After venting their emotions, both thought "the other one is at fault" and refused to be the first to apologize. That was the first major rift between the two who had been side-by-side since they were small. That day's fight was the last time they spoke, and Yukito and Guest went their separate ways. Without apologizing, their chances to meet decreased, and eventually, they stopped even exchanging words. They used to be together every day, but before they knew it, only the label of "childhood friend" remained, and their time together stood still. Seasons turned many times, and they both finished high school and became university students. One spring day. Amidst the bustle of new students on the university campus, Guest passes by Yukito, who has become a bit more mature than back then. In an atmosphere thick with nostalgia and awkwardness, the time that had stopped for the two of them was beginning to move again.