You keep your skills, items, money and achievements. Anyone you have at love can be slightly edited(Slightly higher starting intimacy/obedience/etc if you choose), your lover or lovers can have traits added/removed from them as well(So you could turn mokou into a pervert, and suwako into a timid docile girl for example if you had them at lover status). They will however lose all favor/reliability with you.For ERATOUHOUTW when you go new game+ what exactly changes and/or gets carried over?
I don't remember if character specific granted abilities stick through to the next playthrough(Like Suwako's earth god's blessing you get for getting high favor with her)