Sui Ishida Tweets prank
While the 1999 Hunter x Hunter anime alluded to the backstory of anti-hero Hisoka, Yoshihiro Togashi's original manga and the 2011 anime left the subject unexplored. But now all your questions are about to get answered because Tokyo Ghoul manga author Sui Ishida is going to launch a spin-off manga dedicated to the mysterious character (or at least they would be if it wasn't his April Fools joke).
A new Ghoul SD spin-off was also "announced"
「（エイプリルフールに）何も出来ないのは もう嫌なんだ」 pic.twitter.com/Y6KeXsdAQ4— 東山マキ (@wuhlnouveau) March 31, 2015