Doga

Yote is as high-ranked as he is unaware of the reality of the world. As a new lord, he gets the opportunity to leave his castle for the first time of his life to explore the free city of Leoure. But as Yote just starts to get a glimpse of what kindness and freedom look like, he is killed by street robbers. The young man is saved by a mysterious woman who happens to be a talented inventor. She transfers his mind into a cyborg body, allowing him to survive... for a year or two. Yote is now a robot hardly able to move around by himself. But whatever, for him it's the first day of a new life! But to have a life, he needs to become human again. Only the legendary mermaids are said to have the magical powers to achieve such miracles. To help him on his hazardous journey, he hires Doga, a strong and witty street orphan ready to do anything to get out of Leoure and see the world. For both of them, this is the beginning of a road-trip full of surprises! (Source: Futabasha, translated)