The year is 1969 and alien invaders are trying to dominate the world. The only hope for Earth is AEGIS, a group of teenagers with the special ability to open 'Gates' that let them harness elemental powers gated from another dimension. AEGIS must now seek out other gatekeepers in order to stand a chance against the destruction of the world.
Beneath Tokyo lies a city whose inhabitants have inherited a natural ability to control the elements. After a civil uprising, two girls surface from the sub-terra in a bid to escape from this secret world. Together, Chelsea and Ruri stumble upon Asagi Rumina, a man who becomes determined to protect them from those who would pursue the maiden of life. After a close encounter with death, Rumina learns that he must develop a skill of his own to keep his newfound friends safe, especially as it seems to be his responsibility to stop the impending doom rising to take over the planet’s surface. Will his power of wind be enough to take on The Company, or will he be forced to kneel before those brandishing electricity, ice and shadow?