Miharu Koshi -
Bara No Yakai~Arui Wa Amai Mitsu No Imashime

Japanese title: 薔薇の夜会～あるいは甘い蜜の戒め
English translation (as per Google translate): Soirée, or, Sweet Nectar of the Commandments of Roses

Happy birthday (yesterday) to Harry Hosono, who produced this and presumably played the fretless bass(es). Written by Miharu Koshi. See here for another cut from the same LP. Artwork by Satoshi Nishizaki.

Best part at 2:15.