One fact that I forgot to mention is that the myths and legends go inside a sprite called a container with the 10 images (9 frames) of each story, this container has measurements of 1400x788
So how many frames in total are in this sprite? 10 or 250? 250 frames of that resolution will use a lot of memory, you can put it on a blank layout and check in debug view.
But if that's not the case, 150MB should not be causing any issues even on low-specs devices.. You can try getting Logcat logs from the phone, maybe you'll see the error message there.