Valid feedback, thank you! (-ω-ゞ
The game does have an identity crisis with how some characters act. currently I wanted to make the MC and other sinners' morally ambiguous characters, especially the MC, all his actions so far can be seen as good or bad depending on whether you do all the optional sexy stuff or not.
So I guess depend on how you play, he can be either someone who just trying his best to live normally while needing to feed on the girls' energy, or someone who act nice in front of Kiyo and the other girls so they trust him more and more, giving him more chances to do as he please.
This is left to player's interpretation on how he is tho, since I was super green when I start the story (′v‵ )