Detective Ryousuke Kibukawa Case File: May Rain is a Dull Melody/ Tantei Kibukawa Ryousuke Jiken-tan: Samidare ha Nibiiro no Shirabe

It had been raining for days. The days of the record heavy May rain continue. A past event told by a man who visited the Kyukawa detective agency to fulfill his promise he made 8 years ago.