Volume 1: It's ready when steamed
The first time he traveled through time was during the Galaxy Chronicles. His identity was the young cousin of a senior military officer [to be verified], and his mission was to seduce his brother! (What's going on with this unlimited setting? Has your moral integrity in the system fallen into Bermuda?)
Part One Where have you been, Earth?
The second time he traveled was on the eve of the end of the world. His identity was a necessary supporting role in the survival team of a strong but incompetent person. His mission was to seduce the zombie leader (Hey, hey, hey, what do you think when you look at the minced meat in your bowl? Can you fall in love with it?)
Part Two This zombie is not too cold
The third time I traveled through time was on a fresh campus in peaceful times. I was the daughter of the boss, and my mission was to catch the son of another boss (this is normal, but I will never say anything about falling in love with data...)
Part Three Welcome to the Black Club
... Part Four...
... Part Five...