Double Take

Sawada Natsu has a split personality, he dubs his other half 27. And Oh boy is 27 awesome.
but that makes Natsu wonder, Him and 27 are so awesome, So why does Nana feel lonely enough to create an imaginary person to live with them. He has never seen this so called "Tsu-kun", Yet Nana is always dissapointed that he doesn't join them for dinner.

And another question, Why doesn't anyone ever notice that annoying Tsuna kid in the back of the class.

So many questions, but Natsu doesn't really care about the answers, as long as nobody gets in the way of him and 27's High school status.

(or Tsuna and Natsu are twins, but everyone thinks Natsu has a split personality and gives him Tsuna's praise.)