This is about both the award-winning (rightly so) anime and the manga.
I saw the movie a while ago and recently got the manga. The manga for Summer Wars サマーウォーズ was written by HOSODA Mamoru 細田守 and drawn by SADAMOTO Yoshiyuki 貞本義行 and SUGIMOTO Iqura 杉基イクラ. In Japan it was released as 3 tankobon by Young Ace (Kadokawa Shoten) and as 2 bunkobon in English by Vertical. The manga was very good, interesting, etc. and reminded me of the anime movie. The story is seinen, romance, science fiction, mystery drama – with a nod to John Lennon and Yoko Ono.
I re-requested the anime movie and watched it and it’s superb, truly worth the awards it won – beautiful , imaginative, and engaging. The story is about a math genius with a crush on a girl from a samurai family, her family and AI that is taking over/destroying the world. It was animated by Madhouse distributed by Warner Brothers in the US. The only downside was the voice actors and dubbing script was done by Funimation – so you’re probably better off with the original Japanese voice actors and translation. With Warner Brothers involved you’d think they could have gotten better English voice actors (as Disney does) and scripting for the dubbing.
I recommend both. However, I prefer greatly the rich visuals of the animated film.