Yuu: "I can't fall in love with anyone, be it guys or girls" ---> Falls for a girl anyway
Touko: "I can't accept anyone's love, be it guys or girls" ---> Falls for a girl anyway
Sayaka: "GL is not normal" ---> Falls for a girl anyway x2
Teacher: "I like men, not women" ---> Falls for a girl anyway
"Remember kids, if you're a girl who thinks you can't love girls, you will inevitably fall for one." -Nakatani Nio
This is the message of the story all along.
I'm sorry for my shitpost