mc is born into a body of a weak chunnin but sadly he can't get any stronger physically but don't be sad mc has two cheat but two limitations to them.
the first cheat is infinite chakra with the limitations that it hurts a lot to take more chakra more than his body's orginal limits it hurts the more chakra it take.
immortal body as long as mc has the will to fight all killing wounds will be healed but will hurt ten times more.
mc will be 18 during then start of naruto shippuden where he will remember his past life.