Surely DPC will make a harem ending...
People who expect it seem to be a very small minority. I'm included, but I do expect there to be a LOT of conditions and not getting it right leads to some of the worst endings. Kind of like the card game Hearts; getting all the point cards is awesome, but if you miss even one of them, it sucks shitballs.
What the conditions are I obviously don't know, but I expect that:
1) All main girl paths must be open at episode 8
2) You must choose Bella
3) You must kiss Jill on the bench
4) You must not tell Josy about Chad so that Sage stays at Bella's in episode 10
5) You must have a balanced relationship with Josy and Maya
6) You must friendzone Sage until episode 7
7) You must avoid all side girl scenes
8) You must make specific major choices in seasons 1 and 2 so that you end up with the Neutral Affinity and have specific DIK and Chick major choices available in seasons 3 and 4
9) You must never choose the Neutral option with season 3 and 4 major choices
It is bound to be convoluted and at times counter intuitive.