A side series of Young Kindaichi's case file. The cases in this series are:

1. "File 1 The First Case of Young Akechi/Alternative title: Farewell, My Dear Friend" (FILE1 明智少年最初の事件, "Fairu Ichi Akechi Shōnen Saisho no Jiken"?)
2. "File 2 Quartet with Intent to Kill/Alternative title: The Perfect Violinist, Akechi" (FILE2 殺意の四重奏, "Fairu Ni Satsui no Karutetto"?)
3. "File 3 Ghost Swordman Murder Case/Alternative title: The Pride Murder)" (FILE3 幽霊剣士殺人事件, "Fairu San Yūrei Kenshi Satsujin Jiken"?)
4. "Special Story Kengo’s Room" (スペシャルストーリー 健悟の部屋, "Supesharu Sutōrī Kengo no Heya"?)

(Source: Wikipedia)