Fairy Tail: Starting with Fairy Queen Erza

Ian time-traveled, but he wasn't panicked at all...
Panicking won't help; after all, he'd been transported to the Fairy Tail world, where danger is at its maximum!
In a magical world, if the final boss is immune to magic, what's the point of fighting?
Let the protagonist deal with this overpowered situation...
All Ian wanted in his life was to coast along in the Fairy Tail guild.
Until X778, a small, crimson rice ball came to visit.
Ian then activated the dream simulation function.
Thus, Ian travels across countless timelines to avert tragedy.
In Ian's dream, he traveled back four hundred years and killed the general who had slept with Eileen.
He saved Gray's family and Uru, and incidentally defeated Deliora.
Help August reunite with Mavis and her son, and incidentally, send August to the Western Continent as an undercover agent...
Just when Ian thought this was a dream come true.
Eileen: "Yes, Erza is your daughter."
Ian: "Huh?!"
Selene: "Ian, you have to admit what you've done."
Ian: "Admit what? That's all in my dreams. Can't I be a little more unrestrained in my own dreams?"