I Am Playing the System in Another World

A modern orphan has a sister who depends on each other for life. He accidentally obtained the system and traveled through time with his sister. What kind of top-notch skill weapon? What a panacea? What Naruto Jutsu? It's no problem, See how the loser boy gets the system and leads her sister to defy the odds. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.