Sekai wo Sukutta Saikyou Yuusha ni Stalker sareru Mura Musume no Hanashi

Freesia, a plain, bespectacled village girl, is for some reason being stalked by the hero of mankind, Hero Irving! When she tries to ask the people around her for help, all she gets are congratulatory messages. After he proposes to her with an "Unremovable Ring," she tries to escape the village, but is immediately discovered by [Clairvoyance] and then held hostage to have a date with the hero for the sake of world peace. Out of options, she decides to defeat him with her own hands (but her fighting skills are crap...) So to become stronger, she decides to go on a journey to train...?