The fairy tale manga is mostly true to the original story. It might simplify some complex parts or emphasize certain aspects for better visualization, but it doesn't stray far from the essence.
Not much. The Danmachi manga mostly sticks close to the source material.
The Overlord manga closely follows the original. There are occasional tweaks, but they don't significantly impact the plot or the essence of the story. Fans generally appreciate how closely it adheres to the source.
Not much. The Berserk manga mostly sticks close to the original concepts and storylines.
It doesn't deviate much. The manga mostly sticks to the key plot points and character developments of the source material.
Not much. The free manga usually keeps the core plot and main characters similar to the paid version.
It doesn't stray too far. The Re:Zero manga mostly adheres to the key plot points and character developments of the source material.
Not much. The manga mostly sticks to the core story with just a few tweaks for better presentation.
It doesn't deviate much. The manga mostly sticks to the key elements and plot of the original source.
Not much. The JJK manga and anime are pretty similar, with just a few tweaks here and there.
Overall, the Boruto anime follows the manga to a considerable extent. There are a few added subplots and some tweaks for animation, but the core story remains similar.