Before the smell of engine oil in the Heart of Rust has dissipated, mechanic Akai's life has been split in two by a war of ideas. When the rational federation's mechas laid waste to the mining area, and when his childhood sweetheart Leah said "sacrifice is a necessary logic" in the uniform of the enemy, he understood: what was burned in the mecha's gunfire was always different beliefs in survival.
In order to end this battle of ideas cast in steel, Akai wants to build a special mecha [Hong Furnace] - but can it really reconcile the incompatible camps? The "United Ones" conspiracy to force unification had just been broken, and the "Whisper of the Void" made the pilots forget why they were fighting, and even Leah fell into self-doubt.
When the core of [Honglu] was shaken by contradictory ideas for the first time, Akai suddenly realized: What he had to fight might not only be the visible enemy, but also the greater abyss hidden behind the "meaning". And this road to breaking through the symbiosis with mechas has just begun...
