I'm this book, some Sanses work in a mental hospital (the Star Sanses, and a few others), others are insane (the Bad Sanses).
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Sane and Sanity were twins, they were both insane. They looked like a mirror image of each other, but they were different personality wise.
They lived their whole lived in the mental hospital, they even went to the school there.
The twins birthday was 06/06/06 (2006), which makes then a year older than the author. {I legit can't have a book without breaking the 4th wall huh?}
Every one was terrified of the twins, except one person. Blueberry.
He visited them daily, they liked him and he liked them, apart from the unusual nature, they were normal teens.
One day, Blue didn't visit them, it was the 5th of June. Sane got upset and Sanity got angry but comforted Sane either way.
This will be the story of how they escaped the hospital and who they meet, will they cause havoc? Will they live their lives as normally as possible? Will they meet Blue again?
Reborn in the Naruto world, Shin Uzumaki finds himself in the doomed Land of Whirlpools. As a member of the Uzumaki Clan! Trapped in a world filled with war, betrayal, and unimaginable power, Shin's survival seems impossible.. Until it isn't!!
[Ding! Replication System Activated!]
[Daily Login Reward: Common Replication Card.]
[Newbie Gift: Perfect Sage Body-Adamantine Sealing Chains-Four Symbols Seal]
With the power to Copy any Ability-whether it's the Kekkei Genkai or Rinnegan or Forbidden jutsu-Shin begins his journey to dominate the Ninja World.
[First task: Save Kushina and prevent the destruction of the Uzumaki Clan.]