wow, you really gotta hand it to this author. it's not everyday you see a story whose characters are almost all gay that still manages to be so annoyingly heteronormative
Well maybe because they aren't. They were turn magically gay over night from totally straight girls.
and from the comedy framing, it doesn't look likely that the protagonist's idea of "normal" will be challenged, either... eugh.
She doesn't think it is normal, because she is the only girl that wasn't affected by miracle magic, so she still is straight and doesn't understand why everyone is suddenly openly gay. She has nothing against being gay, it just wasn't something she saw everyday from every angle, so what felt "normal" to her yesterday, suddenly is not normal anymore. Also challenging her perception of normal seems to be kinda the premise of this manga as she is the only straight girl left in yuri paradise.