Volume 2 of manga.
I just realized, since this series is published under Ichijinsha, J novel club could probably easily take this series under its wing since it has a contract for otome game flag.
@Lotteliese@Lily-Garden I haven’t read it (yet. I bought it a long time ago, though), but just judging from it being published by Arian Rose and coming from normal Syosetsu rather than Moonlight, it probably doesn’t get super steamy.
Recently I've managed to get my hands on the two drama cds for this series. They cover the first two volumes of the novel and although I wasn't able to understand it all, it was nice to listen to the voices.