A girl losing her memories falls in love with the boy who once promised never to forget her.
Diagnosed with a rare degenerative brain disorder, Sakuragi Aoi has only 100 days left before her memories start to vanish forever. Desperate to hold on to her fading self, she seeks out the one person who once made her world feel real—Tachibana Ren , her childhood friend who no longer remembers the secret they once shared.
But as their connection rekindles, Sakuragi Aoi begins to uncover the hidden reason behind her illness… and realizes that Tachibana Ren might have been the cause of everything all along.
In 100 days, she will forget.
But can love remember what pain has tried to erase?