A/N : New story yay~ this one crossover that had been bugging my mind for a while. So I finally decided to write it….in the bus on the way to another city.

So, yeah this prologue not edited yet, but at least I hope you all enjoy this ride~

RX-0 Unicorn Gundam 04 Leviathan

Unicorn gundam 01, had deemed lost to unknown hand after its last pilot, Banagher Links disappear alongside with his gundam after the proclamation truth of Laplace Box. EFF though had declared Unicorn unit 01 already dismantle, nor we believe that as we knew the truth.

Unicorn gundam 02 Banshee current location also unknown, as it's last pilot, Riddhe Marcenas currently MIA.

Even the latest RX-0 series, unit 03 Phenex, was reported to departed from this universe, as it protected Humanity against the Newtype attack via gas station critical explosion. Even though this only a rumor as it happened recently, the original source was a credible person based on his data.

And now, unknown to the world, even EFF, Zeon and Headquarter of Anaheim company, a branch in Space base near mars, is currently trying to decrypt the mysterious relationship between Newtype and RX-0 Unicorn gundam series. Funded with unknown source and backing from a rich man who very curious about Newtype, the build another gundam with RX-0 code, the gundam called RX-0 Unicorn Gundam 04 Leviathan. Similar to other RX-0 series, the mobile suit was full of psycoframe, hidden with very familiar gimmick of other series. Mobile suit color was a blue, with design reverse horn on its head, and shark fin-like backpack which turn into side wingblade when destroy mode active.

After the building phase completed, the so called richman was impatient and wanted to be first pilot of Leviathan. Although the engineer felt somewhat reluctant, they also could not refuse as she was their main income, also the reason why this hidden agenda viable as they only minor worker in Anaheim, who also curious about RX-0 series, aside from their project leader.

So, for the first test flight the so called richman, put up a normal suit and excitedly enter the cockpit of Leviathan.

"Whoa so this is how the inside of mobile suit cockpit" She said as she inspected everything with sparkling eyes.

Seeing their backing like that, the engineer's worry somewhat lessen, and started to feel proud of their work. Leviathan already passed the technical engine test, so it should be fine for this test flight, although the richman wasn't a Newtype so they couldn't test it's NT-D right away.

Then Leviathan ready to launch bay, everyone got ready to monitor all the system. One of the engineers acted as operator and said to the test pilot "All clear, Leviathan is ready to launch"

Hearing that, the richman then amusingly report "Affirmative operator, Sylvia Uruka, Leviathan gundam, LAUNCHING!" she then immediately pressed the pedal and Leviathan gundam was boosting out from the bay. Her time spend at simulation was finally paid off as she could pass as a regular mobile suit pilot. Now in real mobile suit, she could feel the G-force and laughing because of her dream finally came true.

Then the intercom lighted up as face project leader came to view.

"Okay test pilot, don't be too excite and start the test, you already remember the content we discussed before, right?" The project leady was someone between 40 to 50s, with his white beard and hair, but his face still showed that he had once a handsome fella.

"Hahaha of course I remember uncle, who do you think I am after all? I'm the youngest and most brilliant CEO of Uruk corp!" laughing Sylvia as she started to move based on test material.

The project leader could only shake his head as she wanted to retort her, that her identity should be a secret, nor the other engineer already suspected after all, with very outgoing personality of her. "Just to the test, and come back immediately Sylvia"

"Aww, please give me free time to play with this machine after the test please~ It's not like everyday I got to flight a mobile suit~ especially a gundam~" She said as she used her ultimate weapon to plead her uncle.

"... Fine, five mins only, and you must not slack or prolong the test if you want to get your free time" Which it worked.

"Yay I love you uncle! Sylvia Uruka reporting, now start test from module one…"

With newly found vigor, Sylvia started to do the test one by one, as the engineer monitoring everything. The result was between expected number, and the pilot condition also fully supported.

Although it was good if nothing happened, sometimes later…

###############

"...and that for module 42, how is it operator?" She said after doing some maneuvering.

"Report received, all good test pilot"

"Okay now for module 43…"

Then all engineer got ready, but there was one thing they forgot, as they felt something was off.

From module 43 onward, it was test needed for the pilot to be a Newtype, so as far as they remembered, that wasn't inside their discussion before.

But before any of them told operator to contact Sylvia, she already started the instruction for module 43. Which including starting NT-D.

Sylvia who didn't suspect anything turn on the NT-D System, and everything going very wrong as she lost her conscious.

And the The RX-0 Unicorn Gundam 04 Leviathan turn into its destroy mode