Currently, the tag kenka-banchou-otome is the parent tag, and it has the synonym girl-beats-boys. Can we reverse the direction of the synonym to make the parent tag as the one with the English title? I think this would be in line with the current policy.
This is a bit complicated.
Kenka Banchou Otome is actually a media mix. In this case, the Kenka Banchou Otome series originally started as a PS Vita game. Later in 2015, a manga titled Kenka Banchou Otome ～Koi no Battle Royal～ (also known as Kenka Bancho Otome: Love's Battle Royale) was published. Then in 2017, an anime adaptation titled Kenka Bancho Otome -Girl Beats Boys- was broadcast.
However, looks like Viz licensed the series as Kenka Bancho Otome: Girl Beats Boys instead? As per an article on AnimeNewsNetwork and a tweet by Viz when they licensed the "Love's Battle Royale" manga,
Announcement! @ShojoBeat has acquired Kenka Bancho Otome: Girl Beats Boys!
As such, I'm still not sure if using Viz's naming as the tag makes sense in this case since the subtitle for the manga is actually different.