Some of them fit really well but others made absolutely no sense:
Opening Credits: "Each Other" - Katharine McPhee
Waking Up: "Irreplaceable" - Beyonce
Falling In Love: "Crossover Interlude" - Utada
Fight Scene: "Mr. Q" - Jolin Tsai
Ultimate Betrayal: "All Is Full of Love (Strings)" - Bjork
Breaking Up: "Wishing" - Ayu
Make-up: "Violently Happy" - Bjork
Secret Love: "Crazy 4 U" - Koda Kumi (PERFECT)
Life's Okay: "Push It" - Garbage
Happy Dance: "Split Personality" - Pink
Wish You'd Lived: "CRAZY ~live version~" - Kamiki Aya
Driving: "Everything" - Stacie Orrico
Regretting: "Wait & See ~RISK~" - Utada Hikaru
Flashbacks: "After the Rain" - Angela Zhang
Long Night Alone: "The Grass is Green" - Nelly Furtado
Reality Check: "SHAKE IT" - Koda Kumi
Turning Point: "Give It to Me" - Kylie Minogue
Final Battle Begins: "Sunday Morning" - No Doubt
Turn the Tables: "Skin" - Madonna
Victory: "SWEET PAIN" - MISIA
Death Scene: "Take to the Sky (Russia)" - Tori Amos (That one fits pretty well)
Final Ending: "Exodus '04" - Utada (That's a good one)
Credits: "Make It Last Forever" - Ciara
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