These Coaster could you get when you visited the NicoNico (ニコニコ) Cafe at PARCO in Ikebukuro (NicoNico Headquarter). With each drink you got one random coaster. The cafe was open from 24th November 2014 to 7th December 2014.
From 18th to 28th October you could suggest your design for a drink, that would be available in that cafe.
Size: ?? x ??