Soul Falling Mecha World

A strange world. When he set foot on this planet, everything he saw was dead silence. There was no bustling crowd, and no friends were seen. It was as if he was alone in the whole world. However, just when he was confused and helpless, a girl appeared in his field of vision. The girl was wearing a strange-looking object on her chest, emitting a mysterious and faint light on this desolate planet. The boy's eyes were attracted by the strange light-emitting object on the girl's chest, and he walked towards her involuntarily. The girl seemed to be aware of the boy's approach, and slowly raised her head, their eyes facing each other, with surprise and doubt hidden in each other's eyes. "Who... Are you? Why are you here?" The boy was the first to break the silence, and his voice was particularly abrupt on the silent planet. The girl frowned slightly, with a trace of vigilance flashing in her eyes, and asked: "It's my turn to ask you. This is where I have always lived, and I have never seen anyone appear out of nowhere like you." The boy scratched his head and briefly recounted his experience of coming to this planet inexplicably. After hearing this, the vigilance in the girl's eyes receded slightly, replaced by a trace of curiosity: "I have never heard of such a bizarre thing. Maybe there is some unknown secret hidden behind it." At this time, a strange roar came from the distance, like the sound of some large machinery operating. The two looked at each other and saw tension and uneasiness in each other's eyes. "What is that sound?" The boy clenched his fists subconsciously. The girl looked solemn and whispered: "I don't know, but I feel