Collection revivals do not work the same way as farm ones do. You collect crystals and buy the girl + copies with them. I still keep praying they'll turn all Lianas into Illys and then throw the Liana event at us...
Im betting on nagi's event.
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But did they do two two-week events back-to-back in the past? If so, they might as well give us both of Anya revival events as a combined Cristmas-NewYear present then