I, the God of Second Dimension Strategy

After traveling to the world of Date A Live and accidentally obtaining a god-level strategy system, Qi Tian was surprised to find that he actually had two sisters, Gokawa Kotori and Gokawa Shiori.
Not only that, from time to time you can also conquer other elf girls, or descend into other two-dimensional worlds, and continue to become stronger.
From then on, every world was left with the myth of Qi Tian and the countless girls who followed him.