honestly after replaying the game 3 times to try to get all the endings in the future, I don't see any implications of romance between you and the girls? It's clearly a platonic relationship the mc shares with everyone else and i'm certain it's meant to be that way. I think jan said in a q/a confirmed that he didn't want to write romance routes into the game bc it'd feel to harem-ish. personally I feel if the game were to have this in the future, it'd be problematic and esp cheesy af to create a potential romance option when theres no implications or buildups. there was actual proper buildup to address melia and venam's relationship and sm hints too (ep 10-12 is literally filled with notsosubtle hints; they sleep together on the same bed, and their reactions to seeing eachother, venam promising to be less selfish for melia, melia activating her god powers bc of her friendship w venam). if there was romance between the mc, it'd be like pulling a jk rowling and pandering to the community w meaningless fanservice
if there was romance then it'd be written in earlier. you're interpreting friendship as potential romance imo. . anyways feel free to have ur own intrepretations and headcannons but just note that the devs never intended to write in romance from the start