Insen scale

Insen is a tuning scale adapted from shamisen music by Yatsuhashi Kengyō for tuning of the koto. It only differs from the hirajoshi scale by one note.
In D mode it consists of: D-E-G-A-C so it has the same notes as the Phrygian chord.
Other chords compatible with insen scale include M7♯11 when the scale is played half steps lower and Cm6 and Cm when the scale is played one full step above.
In India's Carnatic & Hindustani music systems, this scale corresponds to Revati & Bairagi Bhairav respectively.
Other scales related to koto instrument include the Hirajoshi, Iwato and Kumoi-choshi scales.