These coasters were available while the AniOn Station (アニON Station) was held. It was held in differen locations on different periods from 2015 to 2017. Normally all coasters came with different drinks you ordered.
Manufacturer: Bandai (バンダイ) / Namco (ナムコ)
 

2015: The 1st Cafe was in Spring 2015 between 6th April 2015 and 6th May 2015 in Shinjuku.
Size: 80 mm (round)
Year: 2015

Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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2015: The second season was a short special birthday event held also in Shinjuku from 27th June to 30th June 2015 to celebrate Usagis and ChibiUsas birthday.
Size: 80 mm (round)
Year: 2015

Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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2015 / 2016: There was a thrid season in Fall 2015 in the time between 3rd August 2015 and 28th August 2015 also in Shinjuku. This had a revival in early 2016 with same coasters. It was in a different location, in Osaka held from 16th January 2016 to 14th February 2016. The coasters had the correct date, but the image was the same.
Size: 80 mm (round)
Year: 2015 / 2016

Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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2016: A few months after the revival Cafe there was a new Crystal Season III cafe hold in Shibuya and Osaka in the time between 4th April 2016 and 9th May 2016. The Saturn Coaster could only be obtained by collecting the three talismans (see below). If you collected those by drinking Uranus, Neptune and Pluto you could order as many Saturn drink as you liked.
Size: 80 mm x 80 mm
Year: 2016

Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Size: 90 mm x 55 mm

Sailor Moon Namco AniOn Station
Uranus
Sailor Moon Namco AniOn Station
Neptune
Sailor Moon Namco AniOn Station
Pluto

2017: For the 25th Anniversary the Cafe was held in Akihabara in the time between 25th April 2017 and 28th May 2017
and also in Nagoya (Become Store), Osaka (Namba Parks Store), Sapporo (Esta Store) and Hakata (Hakata Bus Terminal) in the time between 9th May 2017 and 28th May 2017
Size: 80 mm (round)
Year: 2017 

 

Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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Sailor Moon Namco AniOn Station
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