Need help with Madou Koukaku completion

[MoeKyun]

So I just finished all the 3 route, and 1 H-scene is missing.

After searching what this scene is, it's that :

Spoiler

4P with corona, neneka, and patirna.

So then I'm going through Overlord route from beginning again, but in the end the scene didn't happen, again.

Anyone know/remember the specific requirement for that scene?