In a tranquil Japanese garden, a prized koi fish named Sakura had vanished without a trace. Her owner, Mrs. Tanaka, was devastated and called upon her friend, Detective Yamamoto, to investigate.
Upon arriving at the scene, Yamamoto observed the garden pond and its surrounding area. There were no signs of a struggle, and the pond's protective netting was still intact. It seemed as though Sakura had vanished into thin air.