Birthday Wonderland

Akane's birthday celebration is underway when she receives a request from her aunt Chi to collect a birthday present from her shop. While browsing the shop, Akane notices a peculiar slab with a hand-shaped depression and, being curious, decides to test it out. Her hand fits perfectly into the depression, and soon she encounters Hippocrates, a self-proclaimed alchemist, and his apprentice Pipo, who claim to be from a world linked to the shop's basement.