You Do Need power plug adapter while traveling from Germany to Bangladesh.

Here is Why You Need An Adapter

The outlet and plug type used in Bangladesh are A, C, D, G and K and in Germany are C and F. This is how they look like.

Germany

In Germany, outlets of type C and F are in use.

Type C

Type F

Bangladesh

In Bangladesh, outlets of type A, C, D, G and K are in use.

Type A

Type C

Type D

Type G

Type K