I feel bad for Watanabe. She is too naive to understand that she is being tricked into having sex. I almost want to protect her smile, but the sex was too good.
I would argue that the consent with Watanabe was ongoing. If you are in a sexually active relationship you only need a base line of consent. Consent was given once she opened her shirt. I don't want to victim blame but the ghost entered a situation already on progress without knowledge of a safe word.
Exorcism...Weak to sexual interference...
Convincing stuff indeed. Though in the Hentai world, I'd sooner believe the ghosts would actually come out to either watch/join in. Not exactly what happened, but in the end the ghost actually just possessed her body and had sex with the guys anyway. I mean, she tried to chase them away verbally, not that it'd work, but ended up just spurring them on.
Great ending though. That middle finger just makes it all that much better.
"Ghosts are weak to sexual interference." ... somehow when I saw that comment, I recalled the words of the late, great Adam West, from a 1960s episode of 'Batman': "Smells Like A Trap." (in this case, a trap for the lone female group member, Watanabe-kun).
In The End, sexy time and Watanabe saying 'sayonara' to her virginity notwithstanding, it seems they at least managed to awaken a ghost. But has the ghost departed to eternal rest, or will it come back to haunt them?
Perhaps a sequel story will answer those questions.
Watanabe wasn't a virgin, the ghost was. The occult club has been having sex with Watanabe for a while. That's why when she said I'm a virgin the guy asked if that was the scenario they would use today.