While this game features official art, backgrounds and music in the style of the original series and full-voice, it is fundamentally different from the first Girlfriend of Steel.
The Dating Sim is a type of game designed to set up goals, usually in the forms of schedules and stats corresponding to social skills, which must be achieved to discover a story focused entirely around the Character Development of the player's chosen girl/guy, get into his/her pants, or both.
This leads to Multiple Endings, though some Dating Sims make it possible to see several of these "endings" in a single playthrough.
Some Sim Date games have been made into Harem anime, though the result is usually nothing special due to the removal of sex and the fact that the narrative can no longer focus on any single character.
Asuka Langley Soryu is Shinji's childhood friend and neighbor, Kaworu Nagisa is an enigmatic playboy type who has known Shinji for years, and Rei Ayanami is a hyperactive transfer student.
Although the game's name suggests it is a sequel to the previous Evangelion visual novel Girlfriend of Steel, the story is unrelated.