I read this series several years ago in fan translation, honestly probably not one of my smarter decisions, I’ll admit.
It’s a series I wish would be officially translated, as it’s a very good series. But it deals with some weighty and even controversial subjects. It’s not a fun and lite read at all.
So, in the very improbable chance that some manga translator/publisher is keeping an eye on these boards, I’d like to point you towards this series. It’s short, only four volumes, but it has a lot of punch. A few years ago, another weighty series, A Silent Voice, had great success, and I think that Bitter Virgin could fill much the same kind of spot.