The 22-year-old lead overnight after the short program and followed it up with the best free skate to claim a comfortable victory.
The Olympic silver medallist racked up 196.80 points with American Ashley Wagner some way behind in second on 181.93, with Japan's Akiko Suzuki claiming third.
And there was plenty more for Japan to cheer as Daisuke Takahashi followed Asada’s lead to claim victory in the men's event.
Takahashi could only manage the third best free skate score but the damage had already been done after recording the best short program and he took the title from compatriot Yuzuru Hanyu by almost five points, Canada's Patrick Chan finishing third.
Americans Meryl Davis and Charlie White held on to their overnight lead in the ice dance to leave with the title.
They racked up 183.39 points to claim victory, with Canada's Tessa Virtue and Scott Moir and France's Nathalie Pechalat and Fabian Bourzat in second and third respectively.
And in the pairs Russians Tatiana Volosozhar and Maxim Trankov leapfrogged compatriots Vera Barazova and Yuri Larionov to take the title.
Barazova and Larionov were leading overnight but Volosozhar and Trankov put on a better show in the free skate to take the victory, with China's Qing Pang and Jian Tong finishing third.
- Ice Skating
- Sports & Recreation
- Daisuke Takahashi