ルフラン +1 · 2013-12-04 · CD · 12 positions on this issue.
“X(エックス)” occupies position 3, sequence number 3 of 12, on the COCP-38334 edition of ルフラン +1. This issue was released 2013-12-04 on CD.
It follows “昨日に乾杯”. The next position is “飛んでイスタンブール”.
Title and placement follow the cited official release page. The linked ルフラン +1 essay supplies musical context; this position does not independently infer writing credits, duration or a recording match with a streaming file.