What if Sega preferred Eternal Champions?/Mega Man V

Plot
In the year 25XX, humans and Reploids now coexist peacefully, successfully restoring Earth's former nations thanks to the technological efforts of Slither Incorporated. However, the heroic Maverick Hunters X and Zero have long since vanished. The peace is interrupted when several incidents of reploids becoming Mavericks are reported, making several areas dangerous. Trading between nations became obstructed, forcing the nations to become divided into utopian cities. These cities became safe havens for peaceful reploids, humans and the cyborg humanoids.

Still, Maverick attacks occur in the frontier regions, which are more exposed to the enemy. To repel the attacks, the humanoids in these areas developed an organization devoted to the defending their region called The Resistance. The Resistance defend the Outlands and investigate the cause of the Maverick attacks. The original leader of the Resistance disappears during the investigation of an Outlands area.

A decade prior to the beginning of the story, the protagonist, Vent loses his mother to a Maverick raid on an amusement park and becomes orphaned. He is taken in by Girouette, the owner of Giro Express, which is a delivery service delivering all kinds of items. Giro is contacted by an unknown person to deliver an important package containing Biometal Model X to a rendezvous point in a forest.

Vent and Giro are ambushed by Mavericks after meeting up. Vent escape the area while Giro covers their retreat. Here, he meets face-to-face with A human scientist named Ciel, her Cyber-elf Passy, and other Reploid companions. This meeting is cut short when a large Maverick snake attacks the group. Biometal Model X lends its strength to Vent, allowing him to "Megamerge" and transform into Mega Man Model X. With the help of Model X, the snake is destroyed. After finding Giro, in the form of Mega Man Model Z, they board an airship deemed the Resistance's base. 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 Biometal and says that he's also a Mega Man, possessing Model W. He expresses his intent to find the Model W Core, and leaves. but not before revealing his connections to the Ruler of Neo Arcadia.

Vent and Giro conduct missions on behalf of the Resistance in order to buy Ciel time to create a new energy source that will provide everyone with a safe place to live. One day, the base is attacked by Neo Arcadia, forcing everyone to flee. In the midst of the chaos, Ciel confesses to Vent that she helped create Neo Arcadia as a utopia where humans and Reploids were finally able to live in peace with X as their leader, but her plans fell apart when an energy shortage crisis began and X has a change of heart. To counter this, she created the Biometals. X still strived for a peaceful world, but had a new moral judgement. Believing that the Reploid race posed a danger to humans, X began an operation to brand any Reploid whom he believed to be a menace to humanity as a Maverick and annihilate them without a fair trial, in order to reduce energy consumption.

Vent invades Neo Arcadia and battles his way through the Four Guardians: Sage Harpuia, Hidden Phantom, Fighting Fefnir and Fairy Leviathan. After finding Model W, Vent stops a Maverick raid led by Prometheus and Pandora on the highway, forcing the pair to retreat. Vent then receives a signal from Model W, located at the Slither Inc. Head Office. Vent receives his mission to destroy Model W.

After defeating many enemies in the tower and arriving at the top, Vent face off against Serpent, who feeds the Model W core with a lot of innocent Cyber Elfs and then fuses with it. he also possesses a weakened Giro with the power of Model W. A fight ensues, mortally wounding Giro. Vent suddenly reverts to human due to the realization that the hatred of the Mavericks that he has kept inside his heart is the last thing needed to unleash Model W's full power, thus resulting in his temporary defeat. However, Giro hands Model Z over to Vent during his dying moments and transforms into a Cyber Elf. By "Double Megamerging" with both Model X and Model Z, he uses the form Model ZX after gaining courage from the biometals, he challenges Serpent to a final battle. During the battle, the tower collapses, destroying Model W and killing Serpent. The game ends with Vent reunited with his Guardian friends.