Having been bullied for most of her life, high school student Ninon Okamura (Marie Iitoyo) has never once felt comfortable around others. An incredibly introverted individual, Ninon struggles to communicate with anyone other than her family and her pet parrot, who offers her a fair amount of emotional support by remaining perched on her shoulder day in and day out. Ridiculed for her bird and her quiet nature, Ninon might very well have spent the entirety of her high school career under attack, had not her classmate and neighbor, Yuiji Kira (Taishi Nakagawa), unexpectedly intervened.
Easily the most handsome and popular boy in school, Yuiji spent his high school days harassing other students and dating any girl who happened to catch his eye. But beneath his cool exterior, Yuiji was desperately lonely. Suffering from a serious heart disease, Yuiji has only a year left to live but he refuses to tell anyone of his grim fate. When Ninon’s parents tell her Yuiji’s secret by mistake, she takes it upon herself to befriend her dying neighbor.
Promising to stay by his side until the end, Ninon and Yuiji’s newfound friendship begins to grow, and with it comes a meaning and happiness neither of them has ever known before.