After transmigrating for several years, he becomes the least favored son of the daimyo of the Land of Water, with no talent for becoming a ninja.
From the start, his mother is beaten to death by the vicious daimyo's wife. He himself doesn't escape unharmed either: beaten half to death, he is left for dead in the wilderness.
Fortunately, there is always a way out. He awakens a Choice System.
"Ding!"
"The Host has been detected facing a choice in life. The System will give the Host two options."
"Option One: Ever since you transmigrated to this other world, only your mother has treated you with boundless affection. Now that she has been harmed, how can you not avenge her? Return to the daimyo's residence at once and avenge your mother. Deal with the daimyo's wife in the same way, and let her experience a hundred times the pain."
"Reward: Heal the Host's injuries, grant the Host the talent to cultivate as a ninja, and raise the Host's strength to that of an elite jonin!"
"Option Two: Fortune turns, and the tables will turn again. Flee the Land of Water and eke out a wretched existence somewhere else."
"Reward: ????? You've chosen to be a coward and hide your head in the sand. What kind of reward could you possibly get?"