Suzuhebi Kyuuairon

Komazu is a sparrow, and as a sparrow, there's one thing he knows about snakes: they eat small birds. When he encounters Shiratō, the white snake, of course he expects the worst—but instead of trying to eat him, Shiratō saves him from a boar stampede and flees, teary-eyed, when Komazu lashes out in fear. When the sparrow realizes he's perhaps misjudged snakes and decides to learn more about Shiratō, the two grow closer, first as friends and then as something more.

They are predator and natural prey, coming from different species and social castes; can love overcome the laws of nature, despite the differences in their way?

(Source: Tokyopop)