The heroine is the original Naruto character, Uzumaki Mizuko.
It doesn't involve much Naruto content, it was at the same time as Obito, and was taken care of by Kushina. Later he lived alone. After the third war broke out and all his teammates died, he had some mental problems and traveled to the magic world. (The kind of casual reading)
OOC has it, Mary Sue has it, and Mo Gai has it.
In terms of romance, the male protagonist is positioned as TR, so try to keep it as original as possible. Anyway, Shuizi's low emotional intelligence is a hindrance. Can you guess whether the heroine is Gryffindor or Hufflepuff? The preliminary preparation is long and may involve history and WW2.
The heroine is wearing it, her memories are still there, but she still has a young mind, and she has some cheating (the Uzumaki physique is pretty good), and her strength is at least a bit above the Kage. She is naturally stupid, and is a stupid guy like Kenroku, but he has relatively high attainments in sealing and physical skills.
Slowly warming up, I update based on my hobbies.
Intention: Uzumaki Love Naka?