Fairy Tail, This Plot Doesn't Seem Right

Almost invincible in the early stages, and invincible after Tenrou Island in the later stages. Multiple heroines, including Erza and Mira.

You Feng unexpectedly arrived in the world of Fairy Tail and inherited the legacy of the Dragon God of Huaxia. After joining Fairy Tail, he encountered August during a mission and spent time with Mavis. Back at the guild, he saw Gildarts pestering Cana. In the northern lands, he found Ur with Ultear, teaching her magic. When he went to see Erza, Irene had bought a house next door. When he went to see Mira, she immediately threw her arms around him.

Something about Fairy Tail's story seems off. Oh, wait, I guess I did that. Never mind.