Shin Kidou Senki Gundam Wing: Endless Waltz - Haisha-tachi no Eikou
The story follows the plot of the Mobile Suit Gundam Wing TV series nearly exactly, incorporating plot elements introduced in New Mobile Report Gundam Wing: Episode Zero and the concurrently running novel, New Mobile Report Gundam Wing: Frozen Teardrop. Therefore, the manga acts as a retelling of the original animated canon with all backstory and sidestory plot elements incorporated, as the 'complete' story.
(Source: gundam.wikia)