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Kaidan and Dana, a pair of young Steel Trooper (ST) pilots turned mercenaries, manage to get a contract working for the UNCS military, and link up with a machinist named Grant to help repair their STs. However, after just a few missions of running off The Ashes, a supposed terrorist group in Milkhama, the three pilots are betrayed and taken to an underground base for experimentation. The trio manage to escape with the help of an ace pilot named Rosa, who has decided to defect from the military herself. However, after being chased to White Maple, Rosa gives her life to help the others escape. Having been branded as criminals who attacked White Maple and killed Rosa, the trio are forced into hiding in a region of Milkhama where the UNCS can't easily find them. From there, they use what little savings they have to start a delivery company called GKD (after their names: Grant, Kaidan, and Dana) and hope to lay low. However, while chasing down some missing cargo for a wealthy client, the group rescues a strange girl piloting a stolen ST, and finds themselves dragged back into action against the UNCS and other groups hoping to claim the secrets that she holds.
Players arrange a party of 4-5 STs and their Pilots to fight on a map. All STs have four separate HP bars: Body, Left Arm, Right Arm, and Legs. If Legs are destroyed, then the ST can only move 1 square on the map. If either arm is destroyed, then the weapon attached to that arm becomes unusable (or if wielding a 2-handed weapon, it becomes harder to hit the target). If the body is destroyed, the ST is removed from the battlefield completely. Most main stage objectives will involve eliminating all enemy units or a certain boss unit, but there are some others such as moving [x] units to a certain escape point, or holding off attackers for [x] turns.
All playable characters in the game will be "licensed" to pilot one of three weight classes of STs: Light, Medium, or Heavy. They cannot switch types, but they can equip almost any ST pieces within their class. They can also equip any weapon that ST can carry (provided it falls within the weight limit), however the Pilot's Active and Passive Skills may be more suited for specific weapons that will give them an edge on the battlefield.
Mecharashi allegedly started out as a spinoff to the Front Mission franchise, titled Front Mission 2089: Borderscape. The game was developed by BlackJack Studio and produced by Square Enix for mobile devices, and they even released a concept trailer and held a closed beta test of the gameplay in April 2022. However, the game was announced as cancelled in October of that same year. No explanation was given but BlackJack Studio said they wanted "more continuity and control in content creation." Both sides removed all footage and news of Borderscape from their public web sites, but archived footage and news of the stillborn game still exists in other places. The developer, however, still held onto the assets from the beta, and later they released a game called "Mecharashi" in December 2023 in China, with a Japanese release following a few months later (as Metal Storm). It wasn't until March 2025, when Ten Tree Games announced their plans to release Mecharashi in western territories, that Squarenix finally sued BlackJack Studio for copyright infringement in a Japanese court, demanding they take down their game from online storefronts and pay about $150,000 for each infringement. However, in May of the same year, the two sides reached a settlement, and the game was allowed to be listed on global storefronts such as Steam and Google Play. The terms of the settlement were undisclosed, but the dev team reportedly worked to remove any obvious linkage to the Front Mission franchise before releasing the game globally.