Accourding to Agito databook Unknown is confirmed above Grongi The origin of the name「Unknown」 At the initial stage of Episode 1, the origin of the Unknown was not clear. However, when Panteras Luteus appeared, only a few seconds of distorted footage captured by the G3 camera remained. Additionally, it was evident that the entity possessed power beyond the unidentified life form that「No. 4」had fought several years prior. In response, Makoto Hikawa, the G3 operator, speculated that a new enemy surpassing the unidentified life forms had emerged. Upon hearing this, the upper echelons of the Tokyo Metropolitan Police Department remarked,「There's no other way to describe it but Unknown」. Subsequently, the term 「Unknown」, refering to an unidentified entity, was adopted as the designation for this new enemy.