Gate Keepers

In 1969 Tokyo, the city is rapidly modernizing with technology and industry. However, beneath this progress lies a sinister threat: the Invaders, a mysterious group that has infiltrated the population. AEGIS, a top-secret agency, is tasked with combating the Invaders, but only those who can open "Gates" to another world can effectively counter the enemy. Shun Ukiya, an ordinary high school student, discovers his ability to open a Gate after encountering Invaders heading towards his home.