also it's author said this (which breaks my heart a little bit)
For Pride Month, i wrote about Stop!! Hibari-kun, an accidentally trans-positive gag manga from the 1980s about a girl who serves sickening fish and her idiot boyfriend’s inability to chill out about it. @aftermath.site
The focus of "Stop!! Hibari-kun" isn't that Hibari is trans—it’s other characters’ cartoonish inability to chill out about it