no its just a leading theory from the fanbase not confirmed main source its based on a overview conversation in one of the flashbacks. personally i think it was a consentual relationship between the two since this is a harem game and because if it was rape then it would be extremely unlikely hiriko would be okay with the MC hooking up with any of the daughters and there has to be a plausible reason she would be okay with thatWas it confirmed in game? Wife confessed to MC?