The final confrontation in Shibuya Jail is against Alice Hiiragi, who transforms into Cinderella. This boss battle has multiple phases.
Phase 1: Cinderella's Dance
Cinderella is initially weak to Ice and Electric. Focus on using Yusuke (Fox) and Ryuji (Skull) to exploit these weaknesses. She will frequently use wide-area dance attacks; dodge these by rolling away. When she summons backup dancers, prioritize taking them out quickly to avoid being overwhelmed and to build your Showtime gauge. Use Phantom Dash points around the arena to deal extra damage and avoid her attacks.
Phase 2: Despair & Rage
After taking significant damage, Cinderella will become enraged, and her weaknesses may shift or become harder to exploit. She will also gain new, more powerful attacks. During this phase, she often charges up a devastating attack. Look for environmental objects (like the speakers) that you can Phantom Dash into to interrupt her charge and deal significant damage. Continue to exploit any remaining weaknesses and use your Showtime attack when available. Keep your party's HP up with healing items or Morgana's Media skill. The key is consistent damage and avoiding her powerful AoE attacks.
Upon her defeat, you will obtain Alice's Desire, completing the Shibuya Jail segment.