Bleach

The Forest of Menos! The Search for the Missing Rukia (7x16)

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Lunuganga catches Ichigo and the others by surprise and sucks them underground. They awake to find themselves surrounded by Hollow with Rukia missing. Suddenly, they are joined by a whole group of Menos Grande. Meanwhile, Rukia wakes up and has similar encounters with Hollows. She escapes only to find a couple of Menos herself. A strange figure with a mask appears to save her. Just who is this unknown person who wields a zanpakutou?