Shinya Hīragi's Birthday Carnival

"Shinya Hīragi's Birthday Carnival: Shall We Make White And Black Clear?" (柊深夜の誕生日カーニバル ～白黒はっきりさせようか～) was an item collection event that was held in Seraph of the End: Bloody Blades from November 20 to December 4, 2015.