Combination is a police story about two very different men becoming partners to fight crimes in high places. Their combination turns out to be one-of-a-kind.

The story is based on the adventures of a pair of policemen, Hashiba Shigemi 26 years old and Keiichi Sasaki, 22. The two handsome young men are somewhat nonconformist and often act of impulse; especially the impetious Hashiba. They solve crimes with "less-than-orthodox" methods and push themselves to the limits of the legality; Often engaging themselves more on hunches and "faith" than for the same law; but after all they are the best "Combination" that can be found. thus the title of the series. They prefere to take action against the politically corrupt and the dealings of the yakuza. The Japanese Robin Hood?

Volumes 1-2 were produced under CLAMP. After Sei Leeza left CLAMP she continued the series on her own. As of 2006, vol 6 has been the last volume.