Always bisexual, always...
The depiction of bisexuals in yuri manga is awful.
Most of the time, they cheat, lie, seduce anyone who is single or not, always partying, drinking, smoking, put a lit of effort on their figure, like to please people, have multiple relationships at the same but never asked their partners if they want to be in an open relationship and SEX, a lot of SEX.
Whenever their are someone they want to fuck they will always achieve there goal whatever it cost them. They do whatever they want without taking in consideration anyone feelings. Always showed as special and/or misunderstood par others.
Putting that aside, this story have some similarities with others Battant stories.
One of them is women fighting each other over jealousy, comparing each other (even though it's the MC who feel inferior). Her complex of inferiority prevent her to be in a relationship with the person she wanted.
SHe comfort herself in her hetero normal, boring, lifestyle while waiting, longing, for the day she will reunite with Miss Red Lipstick.
A way to say "don't put some stupid obstacles on your way to happiness".