After his classmate and crush is diagnosed with a pancreatic disease, an average high schooler sets out to make the most of her final days.

Kirari, a elementary school student who lacked confidence and always spent her days alone. She loved drawing, and her sketchbook was the only friend she could open up to. One day, she woke up to find a mysterious girl who had appeared and forcibly dragged her out into the outside world. As she experienced new sights, new experiences, and a series of colorful firsts, changes began to take place in Kirari's heart...