ルフラン +1 · 2013-12-04 · CD · 12 positions on this issue.
“Don't let me down” occupies position 6, sequence number 6 of 12, on the COCP-38334 edition of ルフラン +1. This issue was released 2013-12-04 on CD.
It follows “あんず恋唄”. The next position is “フォトグラファー”.
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.