A gang of thieves calling themselves the Santa Claus Gang are wreaking havoc, and the police can't keep up. Police Captain Gilbert is distracted by a Chinese reporter writing a story on his squad, detective Emilien's wife has just announced that she's pregnant, and taxi driver Daniel is in the midst of a relationship crisis. After a string of mistakes in which the thieves outsmart the police time and time again with a reporter there to record it all, Daniel and his super-taxi pitch in.

Hubert is a French policeman with very sharp methods. After being forced to take 2 months off by his boss, who doesn't share his view on working methods, he goes back to Japan, where he used to work 19 years ago, to settle the probate of his girlfriend who left him shortly after marriage without a trace. There he mets his former colleague Momo and his daughter Yumi who he did not know was ever born. Hubert eventually finds out why his girlfriend left him and the reason becomes his and his new...