- Defense Impenetrable
- in Action
A defensive move. Marui uses his "godlike" reflexes to create an impenetrable wall at the net.
First used in New Prince of Tennis 88 against Kimijima Ikuto and Tohno Atsukyo.
- The only way to avoid Wonder Castle is to lob Marui.
- In his duet single Side by Side he says Wonder Castle, a reference to the match he had with Kite.
Wonder Castle in the anime
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