The String Servant of Fate

There existed a world where people can achieve the impossible through belief and spirituality. However, it wasn't easy for any wish to come true. People have to go through trials and hardship; often, they have been the reason for their untimely demise. Yet, swarms of people still try to succeed, going to the extent of stepping on each other's corpses... Just across the continent where magic was forbidden, a man arrives through an unknown portal. Blessed (or cursed?) with the role to serve fate and help it fulfill each person's destiny, how will his journey unravel? And what mysteries will it uncover?