>>11 maybe, but there is evidence that this deluded moron is pretty serious about bringing harm to anything related to Fujimaki-sensei. The latest news on this issue is that a suspicious person was caught on tape by security cameras the same day they found the threat letter and other stuff at the university. Also, it seems as though who ever this is doesn't have much against Kuroko no Basuke itself, just Fujimaki -sensei. That's one serious grudge there, though........
"The police has found there was a high possibility that the liquid sent to Sophia University on October 12th would produce hydrogen sulfide that exceeded the human lethal dose drastically.
It means the sender is really trying to hurt or kill the people who related to Kuroko's Basketball and Fujimaki." - Crunchyroll