I've added some of my own ideas to the original setting of Katekyo Hitman Reborn!...
The 7^3 refers to the 7 Vongola Rings, the 7 Mare Rings, and the 7 pacifiers of the Rainbow Seven. The 7^3's core stones are the very foundation of creation, and also a vital force in maintaining the stability of space and time.
In addition, each of the four corners of the 7^3's core stones holds a Ring of Time, representing the four seasons of spring, summer, autumn, and winter. They watch over and protect the members of the 7^3 and its core stones.
The heroine is scheming and lazy, not all-powerful, and gets one ring and one box.
Paired with Squalo. (Squalo really is incredibly popular...)
Boss Reborn is very angry.
Why isn't it updated? Wow, it's so hard to wait.