Record of Ragnarok
Record of Ragnarok is a manga series.
Also recorded as Shūmatsu no Valkyrie; Valkyrie of the End; Shūmatsu no Walküre.
In detail
The recorded language is Japanese.
It is associated with Japan.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Record of Ragnarok”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q77697747: Record of Ragnarok
Consult the source