Advent of Berserk Yūichirō

"A Terrifying Spell That Leads to the World's Destruction: Advent of Berserk Yūichirō" (世界を破滅へと導く恐れるべき呪術 暴走優一郎降臨) was a battle event in Seraph of the End: Bloody Blades, that occurred from January 13 to January 15, 2016. It featured the character, Yūichirō Hyakuya.