I feel that the grandmother did not accept the proposal. She knows they like each other. In that case Grandma would be the villain for the monk for not accepting. Is the manga still published? The last chapter is 79 in Japanese.
@Istvan90623 The last one is really 79? Thank you.
@Lestatmajere There would be no need, Chion will become a monk, so there is no need to marry the teacher. The monk must not have liked her to deny the proposal, so she would be the villain for him.
Guys, it ain't happening. Name one (quality) manga where the cousins end up together. They like to tease it but never go down that path. Hell end up with the other girl, I'm calling it now.