Hiiro No Koku: 1x4
Hiiro No Koku Episode 4
1 - 1Hiiro No Koku Episode 1 Apr. 18, 2001
1 - 2Hiiro No Koku Episode 2 Jun. 18, 2001
1 - 3Hiiro No Koku Episode 3 Jul. 18, 2001
1 - 4Hiiro No Koku Episode 4 Aug. 18, 2001
1 - 5Hiiro No Koku Episode 5 Sep. 15, 2001