Sayounara Ryuusei, Konnichiwa Jinsei

After living a long life as the strongest and oldest dragon, he is slain by a human hero. He awakes to find himself reborn as a human, Dolan, in a remote village. He works hard as a farmer and sometimes hunts for food. His life is simple in this small village, but he is surrounded by love. He soon finds happiness he'd never experienced in his life as a dragon. However, dangerous monsters are lurking around his village lately and he goes to the woods to investigate when he finds out an army of monsters are heading his way...

(Source: Alpha Manga)