From the Start, I Had Only a Toolbox and Became the Mecha King [Robo Masters]

Blurb: Wang Jiayu was a student at Lanxiang Advanced Automotive Repair School, and her life was smooth sailing. Her schedule was arranged by the school: theory in the morning, hands-on practice in the afternoon, and free computer classes at night. In the future, employers would be fighting to hire her. Her only problem was that her little brother, Luoluo, was addicted to the internet and liked playing on the computer even during thunderstorms. When Wang Jiayu went to remind him to go to bed, she got caught up in it too and was struck by lightning, sending her into the world of a game. Looking at this machine-life world, where not even birds would lay eggs, Wang Jiayu hugged her automotive repair toolbox and fell into deep thought. She put on her welding mask and treated the place like one huge training ground. After a grueling apprenticeship, Wang Jiayu not only mastered automotive repair, but also pushed herself to learn how to repair excavators, helicopters, and even fighter jets. To take her automotive repair skills to the next level, Wang Jiayu punched the Tiger King and kicked the Wild King, then rode around on the Dragon God's neck, throwing her weight around, while the Blue Poison Beast served her tea and water. After mastering every automotive repair technique in the game world, she collected the guardian tokens from seven cities and opened the Heavenly Ladder to go home, hoping to spread her superb repair skills to every corner of Blue Star. She closed her eyes and opened them to see her little brother Luoluo's face. Wang Jiayu thought she had returned to the real world, only to discover that she was still on the desolate continent of the Machine Beasts. The only difference was that it was now a hundred years later, and her troublesome little brother Luoluo, who had become a burden, was by her side. Luoluo, whom Blazing Thunder had mistaken for the War King, clung to Wang Jiayu's leg and swore he would never play games during a thunderstorm again. According to legend, the War King from a hundred years ago wore a black helmet that covered his face, could revive the dead with lightning at his fingertips, and could even control the lives of machines. Meanwhile, Wang Jiayu, who repaired machines wearing a welding mask: ... These tin people seem to have misunderstood her by just a little bit. Since she didn't want to be misunderstood again, Wang Jiayu didn't put on her mask this time. To take her brother home, she went to a lot of effort with her automotive repair toolbox in hand. The City of Time's lord died? Swap out the engine and he'll be as good as new. The Energy City lord is badly injured? Check the wiring board, and he might still be saved. Gold Iron Beast blew himself up? Dig out his chip, put it in a Black Iron Beast body, slap on some gold paint, and he'll be bouncing around again! After countless hardships, Wang Jiayu finally sent her brother and his classmates home, only to discover that each person could use the Heavenly Ladder just once. She had already used it, so she couldn't go back. Wang Jiayu, who couldn't wait to go home, pass her advanced automotive technician certification, and stay on at school as a teacher: ... This is ridiculous!!! Note: This is a self-indulgent, written-for-love story about nonhumans. The tin people won't turn into humans; they'll stay as they are in the animated series. The male lead is still undecided, but there's an 80 percent chance it'll be Tornado. (Maybe not anymore.) Juanjuan is a beloved cutie! Theme: A little joy can brighten up a dull life.