Advent Cirno by Ushiki Yoshitaka Touhou Project Doujin — On Hiatus

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Advent Cirno takes place in an alternate universe, where the Touhou cast is in a Final Fantasy setting, with Cirno as the lead.

Advent Cirno released Dec 7 '06
#0 released Mar 13 '07
-Extra- released Jul 13 '07
-Stardust- released Feb 3 '08 Alice x Marisa
#0-2 released Feb 22 '09
Break Time released Nov 1 '09