Conquest of the Anime Male Leads

I was browsing Bilibili when I transmigrated? And got bound to a System!

The System said, "Please protect the male leads in each world, help them find their heroines, and make them fall in love."

"Got it!"

After going to all the trouble of finding the heroine, the protagonist suddenly realizes:

"Wait, System, something seems off! I think I'm the heroine!"

(World 1: Date A Live. World 2: The Holy Grail War or A Certain Magical Index.)