3 of 4 unreleased coaster prototypes by Creation Advance. My collection is missing the Akakabuto one but you can see it for example in Hornanhurtta's collection. These were recently sold in Japan by seller who had lots of Happinets and CA deadstock to share. To combine some sort of information from their sales posts: "These are rare samples that were to be published, but due to various reasons, such as the effects of the coronavirus and the increase in material costs, they remained prototypes and were taken in only one batch. As for the coasters, we decided not to add the range and focused on only one product, so the prototypes were rejected."
The actual amount of the original and only print of the protypes is a bit unclear but it was mentioned to be somewhere around 10-13 pcs.
