Origin of Bangla Fifth Part Bangal

There was nothing incomprehensible about what Naru had heard from Grandma as a child. Everything from the beginning to the end of those narrations was bound in an unbroken chain of reason. The problem started after crossing the boundaries of the primary school. Everything that was written in the textbook was known, but one of the things that were not understood was the origin of the word 'Bangal'....