No, it doesn't. The anime adaptation of Parasyte had to make some cuts. There are parts in the manga that are not in the anime. The anime is still great, but if you want the complete story, you need to read the manga. It has more details about the characters' backstories, more in - depth exploration of the parasyte society, and additional sub - plots that add more richness to the overall story.
Anime adaptations usually adapt the visual novel's art style to some extent. They may also cut out some of the more text - heavy parts of the visual novel. In the case of 'Steins; Gate', they focused on the most exciting and important parts of the time - travel mystery. They also adapt the character designs to be more suitable for animation, like making the characters more expressive in motion compared to the static images in the visual novel.
Not really. The Nisekoi anime doesn't cover the entire manga. Some storylines and characters might be left out or not explored in depth.
Often, they try to follow the main plotlines closely. For example, in 'Sword Art Online', the major arcs from the light novels were adapted into the anime seasons. They also keep the key character relationships intact. However, sometimes they might condense certain parts to fit the time constraints of an anime episode. In 'Re:Zero', some of the more detailed internal monologues from the light novels were shortened a bit in the anime.
Well, sometimes they adapt it very closely. For example, they might follow the exact plotlines of the light novels chapter by chapter. This can be great for fans of the original novels as they get to see their favorite stories come to life exactly as they imagined.
Disney usually makes the stories more upbeat. In original stories, there can be a lot of gloom and doom. But Disney brightens them up. Like in 'Beauty and the Beast', the original story has a more austere and less romantic feel. Disney added more color, made the Beast more likeable earlier in the story, and of course, put in those great musical numbers.
In general, the High School DxD anime doesn't fully adapt the light novel. Some key elements and subplots are skipped or condensed to fit the anime format. But it still manages to capture the main essence of the story.
The manga adaptation is quite faithful. It retains most of the key elements and plotlines from the original story.
The Parasyte anime is quite faithful to the manga. It manages to capture the main events and character developments accurately. Although there could be some tweaks here and there for better visual presentation, the essence of the manga is well-preserved.
It follows quite closely. There are just a few minor differences that don't change the main plot or character developments.