Black Steel Key: Agreement of the Heart

[Imaginary world, please do not increase altitude] [Hardcore apocalypse × Youth campus × Agreement lifted, transform! ×Original special photography IP (Red Star × Frost Shadow × Intelligent Core)] In 2127, the Kuroshio broke out. The "abyss material" gushing out from the Pacific Rim earthquake zone forced human civilization back to thirty-six base cities. Outside the high wall is the "Rust Zone" occupied by the Corrosion Beast; within the high wall is the brightly lit daily life - and the unknown secret battles. Linjiang Base City, District 7, Linjiang University Architectural Design Class 2, Dormitory 407. Three ordinary college students live here: In the forest, there is hot blood hidden under the gold-rimmed glasses; Gu Han, whose calm and calculating mind hides his tenderness for his sister; Lin Yifeng, behind the black-framed glasses is the wisdom that analyzes all things. During the day, they are "architectural dogs" who stay up late drawing, CAD crashes, and become blackened by measuring practice; At night, they put on their belts, inserted the keys, and the armor grew from flesh and blood - "The agreement is lifted, the cleaning begins!" The red flame driver burns the red of the furnace, the frost mirror driver freezes the blue of absolute zero, and the calculation driver builds infinite silver. From F-level "Beast Soldiers" to A-level "True Gods", they hunted in the Rust Zone, upgraded with corroded cores, and with the acquiescence and protection of the official (SBEC), as "unregistered wild qualified persons", they became ghost heroes guarding the hot pot restaurant downstairs from their dormitory. "Burn!" "Transform in front of the one I love, this is my final agreement!"