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This article is about a location in Ciconia no Naku Koro ni.
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The Glass Sea is a large location in-between AOU Japan and COU Japan and is a source of Spiritium.


The Glass Sea was created in World War III when a solar warhead was launched at Japan. Everything and everyone within a 100 kilometer radius, from central Gifu to Osaka, evaporated and vitrified.[1] The resulting crater split Japan into two territories, AOU Japan and COU Japan, and they have since recognized the Glass Sea as a World War Relic and maintain its status as neutral territory.

After a spirit field containing Rare Spiritium was discovered to be under the Glass Sea, tensions between AOU Japan and COU Japan began rising.


  1. Phase 1, Chapter 3: It's a Wrap Public Bath.
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