The IV△7–V7–iii7–vi progression, also known as the royal road progression (王道進行, Ōdō shinkō) or koakuma chord progression (小悪魔コード進行, koakuma kōdo shinkō), is a common chord progression within contemporary Japanese pop music. It involves the seventh chords of IV, V, and iii, along with a vi chord; for example, in the key of C major, this would be: FM7–G7–Em7–Am. The chord progression may be resolved with the tonic chord, for example in a IV△7–V7–I or a ii7–V7–I progression. IV△7–V7–iii7–vi–ii7–V7–I creates a full circle of fifths progression in the major mode, with V7 substituting for vii°.