[Event] Special Summon: Vocaloid Collaboration

A mysterious stage has appeared, Rin and Len invades Grand Gaia in this Vocaloid Collaboration! Take advantage of the Increased Summon Rates from November 29, 06:00 PST until December 1, 05:59 PST. Head over to the Rare Summon Gate now.

For the official announcement, you can check out this link.