Hitoribocchi no Hana Musume wa Oni no Naka no Ryuukishi ni Koi Negau

The ill-fated flower seller falls in love with the captive dragon knight──. In order to save his beloved dragon, who was injured on the battlefield, the hero of the enemy kingdom, Ricardo, offered his own life in exchange. Captured and isolated with no help, yet still not losing the light in his eyes, he caught the attention of a poor flower seller named Suiren, who instantly fell in love with him… (Source: ABJ, translated)