I was thinking it could be a reincarnation angle, but she's a year younger than Hiro and the last panel showed her mother was still alive when Hiro was 3.
I assumed they were gonna be trans, not gay. Since chapter one said "sexuality and identity" when it showed the two characters. Maybe i'm making connections that didn't exist in the original Japanese.
I hope the husband's not like cartoonishly evil or something. Feel like the story could be way more interesting if he's not too much of a terrible person.
I'm guessing he's probably gonna be at least controlling since she seemed to retreat into her shell when he showed up and from his...