@swimminginsand
Wait, did they officially go out or something? Like that's one-way romance from what we can see right?
If it was 2 way and then 1 of them decided to become unfaithful i'd agree with you though.
@TitanAnteus
If I'm not mixing up the raws with translated stuff they almost had sex before getting interrupted. Also are far hentai is concerned you don't actually have to together for it to be NTR I have seen ones where friends, crushes, and family members are considered NTR. Seems to just require some level of attachment to the person being taken away.
Well, at the very least Kisaragi is like: "Haruki, dude, you got to do it with Kisaragi-senpai too." Seems like she's willing to share. So, at least there's that too.