I know who wrote the poem. FREDRIKA BERNKASTEL!
From Higurashi no naku koro ni. At the begining of each arc, is a short poem by a person named Fredrika Bernkastel. Plus in the first arc, Keichii a loud and brash kid, gets paranoid and kills Rena Ryugu, a cute bouncy charactor. Read the visual novels or watch the anime, If you like rocket to insanity. Higurashi is for you.
this is going to be great ^^