Well the "Who's next in line to die" refers to Dance Dance Dance and the room of skeletons. There are 6 skeletons but we only know 5 by the end of the book.
"where is she""where is gotanda" = Kiki is she, because the whole book of DDD is the protag searching for her. gotanda was eating with the protag when he went missing, but it was found later that he killed himself.
That was a nice find, but i'm not sure how much that would be relevant. it looks like a low grade website so thats never promising
