"Rinkaku" (輪郭, "Contours") is the 28th single by Japanese heavy metal band Dir En Grey, released on December 19, 2012.

In addition to the regular (通常盤 (Tsūjō-ban)) and first press limited (初回生産限定盤 (Shokai Seisan Gentei-ban)) versions, it was also released as a made-to-order limited version (完全受注生産限定盤 (Kanzen Juchū Seisan Gentei-ban)).

This version comes with unique packaging and additional contents, in this case a number of live-recorded tracks from one of the band's 2011 shows.

Subsequently, this version was replaced by the limited production version (完全生産限定盤 (Kanzen Seisan Gentei-ban)), a designation which had been used in the past for the Decade best-of album, as well as the LP-version of Uroboros and Dum Spiro Spero.

The original cover art is created by vocalist Kyo, which was shown at various venues in Japan after release of the single.