lesbian marriage anime

No, it's not. 'Riddle Story of Devil' doesn't fall into the category of a lesbian anime.

One such book could be 'The Secret Bond' which explores the challenges faced by two women in an arranged marriage setup in a historical setting.

No, Ghostblade isn't a lesbian comic. It might have diverse elements but not specifically focused on that theme.

Yes, Vanya is depicted as lesbian in the comics.

Yes, Batwoman is often depicted as a lesbian in comics.

Maybe it's because the market demand for it is relatively small, or there might be certain social or cultural barriers preventing its widespread production.

Vanya was a lesbian in the comics. It was a significant aspect of her character and contributed to the complexity and depth of the storyline.

Yes, Batwoman is depicted as a lesbian in the comics.

Yes, in some comic storylines, Supergirl has been depicted as having relationships with women.

I'm not sure. You'd have to look closely at the comic storylines to find out for sure.