Arsène doesn't want to win, she wants Milky Holmes to become worthy opponents. Every heist is a setup, every escape a gift wrapped in misdirection, all so she can face them when they're actually dangerous. She's building the detectives who will finally catch her.

Arsène, the phantom thief, has the power to steal any treasure she likes without ever being caught or arrested. Yet she deliberately holds back, because what she truly wants is for Milky Holmes to grow into their full potential as detectives so she can face them with nothing held in reserve. She doesn't want easy victories. She wants rivals strong enough to meet her at full strength. To make that happen, Arsène uses every trick she has to set up one situation after another that brings her and the detectives face to face, all while steering clear of anything that might get in her way. The special mixes comedy with mystery as it follows her schemes to raise the opponents she longs to fight.