**About the mysteries**
Q. Why did the Kyuubi's seal gradually fade?
Q. Why was Naruto able to grow up to four tails?
Q. What did Karin do to Sasuke in the past?
Q. Is Kushina alive?
Q. How did Kakashi awaken his Mangekyou Sharingan?
A. It's a secret!! Just keep on reading the manga!