From MangaHelpers:

At the age of six, Shusei’s father is killed while they are visiting Myanmar and he is taken in by the locals and re-named “Shan Ba Ru” (which means “Son of the Dawn” or Akatsuki no Musuko). He becomes a soldier for the Karatoa tribe who took him in and raised him as their own. Ten years later, a Japanese journalist goes to Myanmar to investigate the disappearance of his brother-in-law and his son, but his daughter Sonomi tags along determined to find her cousin ‘Shuu-chan.’ She sneaks along and, due to certain incidents, finds herself in the jungle, although not entirely alone as she’s surrounded by militia, but she is saved by none other than Shan Ba Ru and the Karatoa tribe. She soon realizes that he is actually Shusei and tries to convince him to come back to Japan. But with local and international politics intertwined, Shusei struggles between protecting his people and returning to Japan. [Niffer]