Mirei Park is Haruka's manager and a rival in the idol world. Her 'boss fight' is a high-stakes Audition Battle, a rhythm game challenge. This isn't a physical fight, but a test of your rhythm game skills against a formidable opponent. Mirei will perform flawlessly, so you need to be at your best.

Phases & Attacks (Rhythm Game):
- Phase 1 (Early Song): Mirei will hit most notes perfectly. Focus on hitting your own notes with 'Excellent' timing to build up your 'Tension' and 'Appeal' gauges.
- Phase 2 (Mid-Song): The note patterns become more complex and faster. Mirei will use her own 'Appeal' moves to gain a significant lead. You need to counter with your own 'Appeal' moves and 'Climax Heat' when available to catch up.
- Phase 3 (Climax): The final section of the song will feature the most challenging note patterns. Mirei will unleash her most powerful 'Appeal' moves. This is where you need to use your 'Climax Heat' and hit every note perfectly to secure victory.
Weaknesses & Strategy: There are no 'weaknesses' in a traditional sense. Your strategy is pure execution. Practice the rhythm game mechanics thoroughly before this battle. Ensure Haruka's 'Dance', 'Vocal', 'Charm', and 'Visual' stats are as high as possible through training and activities. Use your 'Appeal' moves strategically to maximize your score and counter Mirei's boosts. Save your 'Climax Heat' for the final, most intense section of the song to get a massive score multiplier. If you fail, don't get discouraged; analyze where you went wrong and try again. Sometimes, a slight adjustment to your timing is all it takes.