One day, the elderly-looking transfer student Tanaka Shori, AKA Billy, arrives at the school. He proclaims himself a scientific genius, but he's actually a commander in the enemy organization! He declares that he'll use his own formula to ascertain Twin Angel's secret identities, but...
From Billy-kun to Yuki!
!إنّها من بيلي-كُن إلى يوكي
Von Billy-kun für Yuuki!
¡De Billy-kun para Yuki!
¡De Billy-kun para Yuki!
Da Billy per Yuuki!
Do Billy para Yuki!
От Билли к Юки!