There's a limit on how dense and plain you can be, this author doesn't know that. Reading this manga is like watching some terror movies where the characters only does the stupiest decisions that no one does.
If you're a teacher and wants to be close with your students, you should say that "fake confession" is a stupid thing that only bitches and assholes do. In high school years, I did some stupid things and got the consequences of it. When you're a teenage, you do a lot of mess and don't realize it.
For those who don't know, "Chupacabra" means "Goat sucker".
Also. Here in Brazil, we have mysterious creature called "Chupa-Cu" that shocked the country.
A fucking hate tsunderes. Just because you're "cute" and love someone, that doesn't mean you have to be a cunt. I tried to watch Toradora, but I couldn't the first episode.