the ending depends on lvl and on your decision to save/ not save your party members before the last battle.
A: get lvl over 150
B : get lvl over 15, save the party
C: get lvl over 15, do not save the party(has an option for girls only)
D: get lvl below 15, save the party
E: get lvl below 15, do not save the party
key 07 is still in that mansion, just in another room, you still can find it in there.
I’ll think about adding the skip option :)