Cast: Sadamoto Yoshiyuki

The manga based on the series, written and illustrated by series character designer Yoshiyuki Sadamoto, has been serialized in Shonen Ace since 1995. The serialized and volumized editions are both published by Kadokawa Shoten. The manga exists as a separate entity from the anime, and features a number of distinct differences (examples: Shinji's eyes are brown instead of blue; Shinji and Rei's relationship is strengthened more; not all of the Angels that were in the anime appear in the manga). Drawing from the original story outline, the completed anime series, as well as his own artistic freedom, Sadamoto has portrayed an account of the story that has both distinct convergence and divergence with the anime version. The series is still in production, and Sadamoto has stated that he is planning to end the series in the 12th or 13th volume.

Summer Wars is about a timid eleventh-grade math genius who has been falsely implicated in the hacking of a virtual world and, with the aid of a classmate's extensive family, must prevent the real and computer-simulated worlds from colliding. 

A spin-off story focuses Kazuma Ikezawa (King Kazuma), Natsuki Shinohara's cousin, as he battles his way in the Oz Martial Art Competition.

Tetsuo is a quiet and uncharismatic boy that completely loves one of his classamates, but she rejects him as a boyfriend. However, his feelings lead him to do anything for her, even becoming her puppet... and what are the real feelings of the girl?

A short 5-chapter story set in the future, about a boy and his passion for motorcycles.