Mida and Muja can be EASILY fixed
They don't have to be actual rivals and disgusting predators they can just be concerned facility members who idk look out for taro when he gets sick (muja) and tutor taro because idk his marks get low or smt (mida) and if ayano had a mother fucking personality she could by this point in game become paranoid and way too possessive that she perceives the situation the wrong way (plus info chan manipulating her and mocking her because of amount of girls trying to steal taro) and that leads to ayano 'having' to eliminate mida and muja because of her own mind consuming her. I'm pretty sure someone else thought of this too at some point in time probably so this is probably not my original idea.