'Act 30' was used twice in the publication. "Act 30: The War Over the Girlfriend" at the end of the 5th volume and "Act 30: Kind Lies" at the start of the 6th volume. With the two one-shots, the total chapter count is 35.
Ohoshisama ni wa Sasemasen! (お星サマにはさせません！, I Won't Let You Become A Star!)
A special short story that was published in a freebie book put out in Sho-Comi. Sneaking into a boys' school to exterminate ghosts! However, what is the boy Chima has always admired doing there...!? (Source: ShoujoMagic)
Shounen Aromatic (少年アロマティック, Aromatic Boy)
Kabuki Takitsugu is a boy who has the family trait of smell. He can smell anyone's fragrance and find their perfect match. One day, a mysterious girl named Hatsune appears before him, asking him to find a match for her. But, for some strange reason.. Hatsune doesn't have a scent.