Girlfriend of Steel 2

Girlfriend of Steel 2 (aka Iron Maiden) is a video game based on Neon Genesis Evangelion, released in 2005. "Gameplay" takes the form of a visual novel, with some dating simulation elements. The story is set in the alternate-universe that Shinji sees during Episode 26 of the original series, with Tokyo-3 at peace and Shinji going about his daily life.

Although this game is a sequel to Girlfriend of Steel 1, it's a "spiritual sequel" only. The potential love interests of Shinji in the game are Asuka, Rei, and Kaworu, although Kaworu is eliminated as an option at one point during gameplay.

The two possible endings are either: Shinji going with Rei, eventually marrying her with the two having a child together or Shinji says goodbye to Asuka when she leaves for Germany, but he's still on the boat when it leaves harbor, resulting in Shinji going with Asuka to Germany.

Girlfriend of Steel 2 Manga

The Manga version of the video game is at it's core, the same, although the some of the characters act different, and it also includes a backstory about Kaworu (who's a mysterious friend of Shinji's instead of a regular junior high student like in the Girlfriend of Steel 2) that isn't in the game.

Shinji in this manga acts more like his anime-counterpart because he doesn't act perverted, while GoS2 video game Shinji is.

And although Shinji's love interests are Asuka and Rei (possibly Kaworu as well), Shinji ends up dating Asuka at volume 04's end.

The Manga of Girlfriend of Steel 2 is 6 Volumes long. Volumes 1 through 4 deal with the events of the Game, Volume 5 is a backstory about Kaworu, Yui and Gendo's days in middle school, while Volume 6 is a flash forward to what happens after the events of Volume 4 when Shinji and the others are adults.

Notes

The End Song for the video game is Mugen Houyou ("Eternal Embrace"), sung by Yoko Takahashi.