Yeah, I took the time to watch this, and this is very messed up. The plot of this anime is Mari Amachi, a Christian girl, transfers to the Perfect Religion Academy, making friends with Saori Minami, who is Hindu. However, the school is run by an evil cult called Black Buddha, which Mari fights by transforming into Guataman, a magical heroine whose strength comes from a sumo belt gifted by Buddha.
Yeah, this is pretty much messed up, as the plot is nonsense, and the main heroine attacks using her rear end (hence the anime title). Also, the various villains go from weird (like a scary newspaper boy) to blatant parodies (like a sumo wrestler in Darth Vader's helmet).
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