The Anime
The TV adaptation was twenty-five episodes long and suffered from budget constraints. A substantial portion of the story is told by panning over still images, with full animation reserved mainly for action-heavy scenes. The anime has a darker setting than the manga, and although it initially follows the basic outline of the manga's plot, the two stories completely diverge by the anime's conclusion.
Also of note is a 30-minute animated movie, whose storyline does not intersect with the TV series. The movie was released several months before the TV series, and benefits from a substantially higher animation budget.
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