Amagase-kun wa Amayakashite Kurenai.

After being saved by a dark-haired stranger from a pervert on the train, Momo Asaba enters her first year of high school hopeful to find him. Unsure of who he is, she comes across a guy, Yuzuki Amagase, who looks like her savior, but acts completely different than she imagined. Momo is stunned by his flashy personality, and vows that she will never fall for him. In response, he asks her to become his girlfriend?! What will Momo say?

(Source: Starts Shuppan, translated)