Phantom: The Animation is a oVA anime that premiered in winter 2004.

About the production: the story comes from a visual novel, there are 3 episodes of about 30 minutes and its current status is "finished".

Its main genres are action, drama and thriller, with themes such as Guns, Gore, Male Protagonist and Memory Manipulation.

On AniList, Phantom: The Animation has an average score of 59%, an average score, and appears on 3,591 users' lists.

Zwei was an ordinary person, until one day, while walking the streets a night, he witnessed a brutal assassination. He managed to avoid the sniper, a young girl named Ein, but was soon captured, and had the memories of his former life erased. He is spared death only by accepting a condition : to train to become an assassin alongside Ein. Now he must find a way to free himself from this shady world and reclaim his life once again. (Source: Anime News Network)

Official synopsis from AniList.