Welcome to a regurgitated combination of homophobic words and pictures that, because it published in Japan, technically qualifies as a manga. AKA "your identity and orientation is just a phase!!1!1" the manga.
Because apparently, even with supernatural time travel BS on her side, the only way to save a lesbian relationship is through the help of a nondescript guy, which I'll charitably assume is not meant to be an audience self insert.
Just read Qualia the Purple (which this one ripped off). It's miles better in both world building and character development. But most importantly, the climax of a relationship between 2 girls isn't resolved by making one of them happily married to a fucking guy.
It's the year of our lord 2020 and I'm just sad that 12 years of mandatory education in a first world country can still produce this waste of sperm and eggs that vehemently believe in that discredited cure your gay crap.