Hitoribocchi no Hana Musume wa Ori no Naka no Ryuukishi ni Koi Negau the Comic

A flower-selling girl with a light heart falls in love with a captive dragon knight... Ricardo, a hero of an enemy country, offers his own life in exchange for saving his beloved dragon, who was injured in battle. The poor flower seller's daughter, Suiren, falls in love at first sight with the sight of Ricardo, who is trapped and helpless, but never loses the light in his eyes... A fantasy romance about a hero with a different status.

(Source: Mag Garden, translated)