Ninon Okamura is a high school student who doesn't have any friends at school and likes to walk around with a parrot on her shoulder. Other students think the parrot is a stuffed animal, but it is a real parrot. Meanwhile, Yuiji Kira is Ninon’s classmate. He enjoys his school days harassing other students and dating various girls, but his secret is that he is terminally ill. Though they live next door, the two never talked to each other at school. Ninon learns from her parents that Yuiji only has a year to live. One day, Yuiji tells her that he doesn't want to be alone and to die, so Ninon promises that she will be by his side until the end.