the thing is that is what I actually did. I left the demoness relationship and focused on the story and other characters relationship. now I have completed events for every characters as well as every mission and only demoness relationship is left for me which is not moving forward for some reason. just for extra information to let you know my situation I have done all 95 events, 95 out of 99 secret events are done out of every character event that I can see only the demoness is left to complete.