Ikusā Wan), is a 1983 sci-fi horror and yuri manga published in the hentai magazine Lemon People.

According to their initial strategy, the Cthulhu use parasitic creatures, called "vedims" (ヴェデム, vedemu), to infest and replace humans across the world.

Iczer-1 searches for her "synchronization partner," a human whose sense of loss and anger at the destruction wrought by the aliens will allow her to co-pilot Iczer-1's mecha, the Iczer-Robo (イクサーロボ, Ikusā Robo), and unleash its full weapon capabilities.

First the aliens transport in their battle station, a giant black marble pyramid, which appears above the skyline of Tokyo, causing widespread devastation.

Initially, the battle fares poorly for Iczer-1, but eventually Nagisa's rage over her parents' murder consumes her, and she triggers, unleashing a huge energy beam that cripples the enemy robot.

The Cthulhu leader, Sir Violet, responds by developing her own version of Iczer-1, the burgundy-haired Iczer-2, and using the traumatized lover of Cobalt, Sepia, as her partner.

In the following days, warfare between activated vedim and human forces, lay waste to most of Earth's civilization, turning the world into a post-apocalyptic wasteland.

Immediately Sepia's morale is broken and Nagisa once again triggers the beam weapon of Iczer-Robo, destroying Iczer Sigma.

Iczer-2 retreats to a shadow realm to brood over her defeat before returning with two elite armored vedims, Reddas and Blueba, and abducts Nagisa.

Big Gold relates that she and Iczer-1 were both created at the same moment, by an ancient alien machine built to grant the desires of its creators.

The Matriarch of the Cthulhu, who would eventually become Sir Violet, had passed within range of the machine just as she exclaimed in despair that her race would die in space and never find a new home.

In a final act, using the power of their synchronization and tapping into the ancient wish-granting machine, Iczer-1 is able to restore Earth to the way it was before the Cthulhu attack.

[1][2] In February 2024, Good Smile Company released a non-scale model kit of Iczer Robo as part of their Moderoid line.