Burn-Up Excess - Season 1 Episode 2 Undies, Go!
Overview: While investigating a nefarious panty thief Rio stumbles upon a clue to the whereabouts of a group of jewel robbers. After a little more investigative work (thanks to Yuji's extensive knowledge of women's legs) and spot of under-cover reconnaissance, Team Warrior discover that the jewel thieves are in fact pre-op transvestites raising funds for a sex change in Morocco! What, you thought they were doing it for the money alone?