Original title was トンネルに何かいる which Google translated as "What's in the tunnel?".

Furinkan mentions that: "The "Sunday Summer Thanksgiving Fesitval" begins in this issue. The contest continues for four issues in total in which readers must collect four entry tickets in order to enter to win one of 27 original colored shikishi from the current series running in Shonen Sunday." I'll post the scan they have. A shikishi (色紙) is just a square paper board often used in Japan for autographs.

July 17th, 2013. Author's note:
"Q: What makes you say "this is my favorite"?
A: Cooler and a nighter."

Furinkan notes that: "A "nighter" is a night baseball game."