The False Fiancée (Female) of the Girlfriend Who Was Proposed to by the Hero.

Hello everyone, nice to meet you. I'm Asakura Tohru, female, and I was a university student. Why past tense? Well, I accidentally fell into another world. A joke? Chuunibyou delusion? A mental illness? ...If only that were the case. Oh, wait, actually I'd rather not have a mental illness—that was a slip of the tongue. Anyway, I fell into another world. It turned out to be a rather peaceful farming village. Moreover, there was a woman from my hometown who had fallen there before me. With her support, I managed to live reasonably well. But then she got a marriage proposal. The person proposing is this world's Hero. Hahahaha, no matter how much of a Hero he is, he sure has the guts to make a move on my precious Ayaka. —Lose your hair. So this is a chaotic comedy between a pathetic Hero, the heroine he's taken a liking to, and the protagonist who's been asked by that heroine to pretend to be her fiancé (hopefully).