Bleach

The Name Is Nel! The Appearance of the Strange Arrancar (7x15)

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Ichigo and the others intervene to save a little girl from 3 Hollows only to find that she is really an Arrancar named Nell. After a short episode, they are interrupted by the appearance of a Guardian who blocks their path to the castle. The guardian seems invulnerable to all their attacks until they get a helping hand from some friends