HIIII I have killed all 8 Manons! For this 4th skills quest, and none of them dropped me the Manon's Cry. Seems odd.. SOOOO My suggestion: INCREASE MANON'S CRY DROP RATE PLS<3 Greetz Chubbs
Just saying that you must of been unlucky. Because Lullatone got his on his 2nd and Starship got his on his 2nd. it's like the time Xenn failed 11x SE 20 in a row.
It will drop for you IF you both have the same quest. If it's your first time doing HTPQ, make sure your party member that's doing the majority of damage is doing HTPQ for the first time as well. Otherwise, if Manon's Cry drops, you won't be able to obtain it.