In November 2010, TYPE-MOON announced that bunkoban editions of Fate/Zero will be published by Seikaisha Bunko, and that the entire series will be split into 6 volumes and be released in 6 months starting January 2011. The bunkoban versions, each featuring a new cover, are printed in smaller, higher quality paper.
Fate/Zero 4 (Seikaisha Bunkoban)
Fate/Zero 4 — 散りゆく者たち — (星海社文庫)
2011-04-08 [650 yen]