Because there was a deeper, darker version of Dragonrend… Now Alduin must learn to live again, not as a devourer of worlds, but as a man.

Things aren't always as simple as they seem. Just because he found himself in a new world, Naruto shouldn't have forgotten this. Now he must deal with angel, fallen angels, devils, perverts and god, all while maintaining a relationship and running his store. Things can never be simple for him.

There were very few things that could rile a 25 year old Naruto Uzumaki up. He was perfectly content to sit in his home, work his normal job, study at a normal school, and in his free time, tinker (read: upgrade in a potentially life endangering manner) with whatever happened to catch his interest. This obviously did not include Devils, or Angels, or Fallen Angels.

I don't care if he doesn't know who I am. I don't care if he is with someone else. Mommy needs him to save her, so I have to find him. I have to find Natsu Dragneel. I have to find my Daddy. After Tartaros, no disbandment.