Shadow & Phantom: The Sixth Player’s Sister. Winter Cup. Kagami rolls his ankle before Seirin vs. Tōō, leaving only 4 players. Facing forfeit, Tetsuya’s adoptive sister—a genius athlete who quit basketball after Teikō—agrees to play one game. She’s better than Tetsuya but chose to stay invisible so he could shine. On court, her swimmer’s strength, skater’s balance, and evolved misdirection dominate. Seirin beats the Generation of Miracles with her as their secret weapon. After winning the Winter Cup, she walks away from the offers and spotlight. Tetsuya gets the rest. But now the Miracles all want a rematch.