Just finished the manga, man what an amazing story my thoughts:
Satou Stays true to his anime counterpart. Very eccentric, suffers from delusions. changes his mind frequently.
Misaki is a different character in the anime. In the manga, she is a huge liar and has a family.
There was more character development of Yamizake which i liked.
Overall the manga was very sad, and darker than the anime. The anime has a lot of comic relief, which I did enjoy, but it would be nice to have an anime based directly on the manga.
What I didn't like:
Megumi's brother's condition drastically improves and he falls in love withy Misaki? WHAT THE FUCK? The anime portrayal was absolutely perfect of the true hikikomori. That was unrealistic even for this anime, left a bad taste in my mouth how this character was handled.
Yamizaki's crush coming back into the story after the film incident was weird as well, then we find out she is a lesbian. Again WTF?
Misaki without her dark past from the anime, doesn't give her much depth in the manga. I mean why would an attractive girl such as herself help Sato? All because she didn't fit in at school?
Some of the transitions are ridiculously fast. One second they are in Sato's room, the next they are in a completely different location.
Now the ending: This manga does not fit a happy ending,however there isn't a lot of closure. It isn't a bad ending like most of you are saying. The main character is NEET, and a hikikomori. You really expect such a drastic turn around? The time skip is only 6 months! Anyway, what I got from it is that Sato and Yamizaki are still working on their game, but are communicating via email since he still moved back home. Sato is working, and Misaki just graduated. Most likely they will mature and most likely end up together. I can see Sato in both endings (manga and anime) eventually leaving the hikikomori lifestyle and starting a family with Misaki, but that is down the line.
I plan to read the novel as well. I have read that is dark like the manga, with alot more drug use/suicide attempts.
Overall I love this story because I can relate to Sato so much. I'm not a hikikomori, but its not like I have a huge support system. I just go to work and school, but alot of the problems he encounters hits home for me. Anime and Manga is a 10/10 for me. If you haven't watched the anime you are missing out. The godlike soundtrack, and sad scenes are just perfect. I teared up a bit in while watching both.
Welcome to the NHK 10/10 GODTIER.