When People Are in the Ninja World, a Bug Occurs in the System at the Start of the Game

Traveling to a ninja world where orphans roamed everywhere, he transformed from a humanoid code machine into a ninja overnight, and the system encountered a bug at the beginning... I understand the truth, but why is this ninja world so different from what I imagined? Why are the two Ramrem sisters of re0 in this world? ! And she also became my maid? ! Forget it, never mind... Because—— So delicious! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.