Neon Genesis Junior High Students

The Neon Genesis Junior High Students (新世紀中学生) is a secret team of 4 in SSSS.GRIDMAN. They have some connection to Gridman prior to the start of the series and are really his Assist Weapons in human form.

History
The "students" somehow got to know of Gridman before the series started.

The first of the team to come in contact with the Gridman Alliance was Samurai・Calibur, who watched over Yuta, and then visited Gridman in the Junk Shop to give him an optimization upgrade and then transform into the Assist Weapon, Gridman Calibur, to slay Dévadadan.

When Anti appeared and defeated Gridman, the rest of the team went to meet up with Samurai・Calibur, who was previously defeated along with Gridman. When the battle was over, Gridman revealed their identities to Yuta and Sho.

Trivia

 * All their names are based off of the English names of the Assist Weapons, as in Superhuman Samurai Syber-Squad.
 * The name of their team is a (rather obvious) reference to Neon Genesis Evangelion.