Last 4 episodes.
05 Echigoji Satsujin Jiken (1989)
06 Karatsu Sayo-hime Densetsu Satsujin Jiken (1989)
07 Bingoji Satsujin Jiken (1990)
08 Biwako Shuukou Satsujin Ka (1990)

Episodes 1-4 are here.

BUY

https://reurl.cc/oyvM0Q (thanks to jfuruk)