Mru, also known as Mrung (Murung), was created by Menlay Murang (also known as Manley Mro) in the 1980s for the Mru language spoken mostly in Bangladesh. Murang believed that the new alphabet could be a redemption for a catastrophe told in Mro legend. The legend talks of the god Turai writing down a script and religion for the Mro people in a book and giving it to a cow to deliver. Unfortunately the cow became hungry on the long journey to earth and ate the book. Thus knowledge of the script was lost.

The alphabet is taught in schools so about 80% of Mros can speak and write it.