Chamaru Vieira is an unsociable high school boy diagnosed with depression, and sees a disparate gray world due to an accident that took away his emotions, parents, and memories when he was a little boy. He has zero friends and niche interests that no one else could relate to, and the person he speaks to the most is his therapist who tries to get him to see color with his senses. On his sixteenth birthday, he runs into Yoru Ringomori—a high school girl equally lonely. Due to their circumstances, they're forced to interact with the outside world to see and report it for what it truly is. Despite these conditions, Chamaru is adamant on being static in his gray world, but finds himself curious as to the girl's uniquely similar angle in life. As they stay together, he wonders if they're similar or unique to each other and society. Whilst all this disrupts the unsociable boy's river of life, to find out the truth of his wonders, he must use his five broken senses and Yoru’s love for apples.