All the Japanese songs I listened to more than 100 times
They're almost all by the same three artists
Utada Hikaru - Passion 2138
Ayumi Hamasaki - Moments 812
Ai Otsuka - Planetarium 582
Ayumi Hamasaki - Heaven 568
Utada Hikaru - Be My Last 484
Ai Otsuka - Smily 442
Ai Otsuka - Cherish 381
Ai Otsuka - Neko Ni Fuusen 318
Ayumi Hamasaki - Jewel 308
Ayumi Hamasaki - Step You 307
Ayumi Hamasaki - Is This Love 301
Ayumi Hamasaki - M 283
Ayumi Hamasaki - Fairyland 281
Ayumi Hamasaki - Carols 274
Ayumi Hamasaki - Alterna 254
Ayumi Hamasaki - Inspire 222
Ai Otsuka - 5:09 AM 209
Ayumi Hamasaki - Rainy Day 206
Ai Otsuka - Kingyo Hanabi 201
Utada Hikaru - Sakura Drops 188
Utada Hikaru - Fight The Blues 188
Utada Hikaru - Flavor Of Life 183
Ayumi Hamasaki - Will 183
Ai Otsuka - Ramen 3 Minute Cooking 181
Ai Otsuka - Frienger 159
Ai Otsuka - Shabondama 152
Utada Hikaru - Keep Tryin' 149
Utada Hikaru - Blue 146
Ayumi Hamasaki - Humming 7/4 144
Ayumi Hamasaki - Ladies Night 139
Ayumi Hamasaki - End Of The World 134
Utada Hikaru - Stay Gold 132
Chihiro Onitsuka - Infection 119
Ai Otsuka - Kurage, Nagareboshi 119
Ayumi Hamasaki - Momentum 117
Ayumi Hamasaki - Bold & Delicious 113
Ayumi Hamasaki - About You 111
Yui - Life 108