Steel Familiar

When the girl awakens, she holds three top-level SSS-level opportunities, but is maliciously ambushed and accidentally binds a seemingly worthless toy truck, becoming the laughingstock of the whole audience. Burdened with huge debts and in a desperate situation, the truck awakens its self-awareness and possesses terrifying power. The two join hands to bravely enter the dungeon, brush monsters, and counterattack, defeating the villain along the way, uncovering the secret of the sister's assassination years ago, and fighting against the mysterious dark organization behind the scenes. The truck also hides the mystery of its cross-world identity. The two sides work together to protect their families and fight against conspiracies that can overturn the world.