Kuro Pie is Pietoro's antithesis: while Pietoro represents the fantasy, Kuro Pie represents reality.
Both in Da'vid and in pleur, Kuro Pie invaded the live stage and caused some troubles here and there (even transforming pleur into "Kuro Da'vid/shito:aL", and they usually performed Da'vid's songs "1 BOX" and "Juunigatsu ni dekita kyoku"). During pleur's Da'vid covers, Misa's vocal parts would be recorded by Yukiya from JILS and played as playback tracks, to which -F-/Kuro Pie sang along synchronously.
Kuro Pie was born during Da'vid/shito:aL lives, since Pietoro admired the Joker from the traditional playing cards, he would cosplay as the Joker and fans started calling him "Kuro Pie", eventually the character took solid form and became the evil side of Pietoro.
Finally, the same day pleur's last CD was released, Kuro Pie released his own solo CD, "悪魔レーシング" (Akuma Racing), a 4 tracks maxi-single full of Kuro Pie's wacky music incluiding electronic beats, car crashing sound effects and even some sort of kuropie'd tropical music.
Along with Pietoro/-F-, he just disappeared after pleur.