What Should I Do If I Randomly Travel Through Time?

Traveling to the comic book world, I actually picked up a girlfriend. His online name turned out to be Black Cat, and he also had a younger sister who turned out to be Teacher Eromanga. But I am just a homebody, but fortunately there is a system to protect me and provide me with benefits. But why did the system teleport me to the world of Naruto? Tentative main world: My sister. Teacher Eromanga. Passerby heroine. I am a student. If you don't like it, don't comment. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.