I recommend "Mecha Hero" to you. This book is a fast-acting sci-fi-mecha novel. The protagonist transmigrated from a fast-acting female protagonist to a mecha world. She became a mecha protagonist there, and she was very powerful. Her main task was to engrave runes on the mecha. Through this skill, she could increase the combat effectiveness of the mecha. The plot of this book was hot-blooded and fantastical. It was very suitable for readers who liked mecha novels. I hope you like this fairy's recommendation. Muah ~๐