A zombie outbreak at the hospital they reside in forces a trio of survivors to venture out into the unknown. This is the first studio movie to utilize Stable Diffusion in a significant capacity.
Even after solving the previous case, the Beni Detective Agency's daily life continues unchanged. Then one day, a young man comes to the office who admires Reiji and wants to work there. His name is Yusuke Yanagisawa. The first request that the two of them make is to investigate the disappearance of a sword used in a play. The client is the leader of a troupe of traveling entertainers.
The story is about a gentle and easygoing girl who likes reading. One day, a piece of paper comes out of a book at the library. It is a beautiful letter called "Sakurasaku". That's when she starts a correspondence with a complete stranger. But who is he?