This book is the second volume of the series Mikoshiba (御子柴シリーズ). The series follows lawyer Reiji Mikoshiba (御子柴 礼司), and I think that there are 4 volumes available now. When I bought 『追憶の夜想曲』, I didn't know that it was the second book of a series, and I really wish I had started with the first one,..