Setting and Characters In the year 25XX, humans and Reploids (sentient
androids) now coexist peacefully, successfully restoring Earth's former nations thanks to the efforts of Slither Inc., an energy development and private security organization run by a Reploid named Serpent. However, the peace is disrupted by several incidents of Reploids mysteriously going
Maverick. Trading between nations became obstructed, forcing the nations to separate into utopian cities. To repel the attacks, people banded together to create the Guardians, a Maverick-fighting defense and investigation force. The group's original leader, Ciel, mysteriously disappeared after an investigation where she discovered a Biometal (a living artifact containing characteristics of someone who lived long ago) called "Model W", which turned her team into Mavericks. In response, Ciel created six new Biometals (based on X, Zero, and the Four Guardians of Neo Arcadia) to counter the growing threat. The current leader of the Guardians is a female Reploid named Prairie, who is implied to be Alouette from the Mega Man Zero series. The player assumes the role of an adolescent human, choosing between either Vent, a boy, or Aile, a girl. This protagonist lost their mother to a Maverick raid on an amusement park ten years prior, becoming orphaned. They were later taken in by Girouette (Giro for short in North America and Europe), the owner of Giro Express (Girouette Express in Japan),
Story Giro and the protagonist are contracted by an unknown individual to deliver a package containing Biometal Model X to a rendezvous point in a forest, but are ambushed by Mavericks after meeting up. The protagonist escapes the area with the package while Giro covers their retreat. They encounter Prairie, but their meeting is cut short when a Maverick attacks the group. Model X lends its strength to the protagonist, allowing them to "Megamerge" and transform into Mega Man Model X. With the help of Model X, the Maverick is destroyed. After finding Giro, in the form of Mega Man Model Z, they board the Guardians' airship headquarters. Later, a Maverick attack is spotted at the Slither Inc. main office. The duo meet the president of Slither Inc., Serpent, and his Reploid guardians, Prometheus and Pandora. Serpent reveals his knowledge of the Biometals and that he is also a Mega Man, possessing Model W. He declares his intent to find the Model W Core, and leaves after using the power of Model W to corrupt a weakened Giro, who attacks the protagonist. Giro is mortally wounded in the fight and hands Model Z over to the protagonist before dying. By "double mega-merging" with both Model X and Model Z, they use the form Model ZX to escape. To stop Serpent, the Guardians, aided by the protagonist, begin searching for the fragments of the other four Biometals, which are each divided in two pieces. After finding four of eight Biometal pieces, the Guardian HQ comes under attack from Mavericks, led by Prometheus, with the protagonist aiding in the defenses. They succeed in defeating Promethus before recovering the rest of the pieces. Upon retrieving all eight Biometal pieces, the protagonist is able to enter a sealed cavern, finding the Model W Core inside. However, they are stalled by Pandora and the Biometal is moved to the Slither Inc. Head Office. The protagonist sets off after Model W to destroy it. After battling through Slither Inc., the protagonist faces off against Serpent, who feeds the Model W core with several innocent Cyber Elves and then fuses with it. Realizing that the hatred of the Mavericks that they have kept inside their heart is the last thing needed to unleash Model W's full power, the protagonist suddenly reverts into a human, unable to continue. However, after gaining courage from the Biometals, the protagonist Megamerges into Mega Man ZX and battles Serpent. The tower collapses, destroying Model W and killing Serpent. The protagonist reunites with Prairie and the Guardians, and vows to continue to work for peace and justice. == Development ==