Sekai wo Sukutta Saikyou Yuusha ni Stalker Sareru Muramusume no Hanashi

For some reason, Fresia, a plain, glasses-wearing village girl, is getting unwanted attention from humanity's greatest hero, Erwin the Brave! She tries to ask for help from other people, only to receive congratulations instead. When she runs away from the village, she is instantly detected by his “clairvoyance” and forced into a date with him, with world peace at stake. She must fend him off on her own (but her fighting skills are weak), so she starts on a training scheme. "You can fall for me or you can kill me? It'll be like a contest." Freedom vs. forced marriage - a yandere doting fantasy! (Source: cmoa, translated)