Tu Bian Ying Xiong Leaf

You is preparing to leave home when she's unexpectedly transported into a different world. There, she encounters an eight-year-old boy, who appears to be naked, and is promptly attacked by assassins from a mafia group that's been chasing him. The mafia leader is revealed to be another assassin in disguise, adding to the chaos. You's shoe is transformed into a warrior after she loses it in the commotion, and it helps her escape by blocking the attackers.