Adapted from Kashiwaba Yukiko's "A Strange Journey from the Basement": On the day before her birthday, the mysterious alchemist and his apprentice appeared in front of the unconfident Akane. They asked Akane to save their world, and without Akane's consent, they forcibly took her to another world, "a wonderland full of happy colors" through the door of the antique shop basement. In this world inhabited by incredible animals and people, the colors disappeared. What is Akane, who was chosen as the savior to protect the world, before the end of the great adventure, and what is the decision to change her life? The special and wonderful birthday that only happens once in a lifetime is about to begin...!