The cover for this volume is a parody of Highschool of the Dead character Saeko Busujima. The sign she is holding says 濡れる (nureru), which translates to "Getting wet". This is a famous line of Saeko's from HOTD Volume 4 CH. 17 "The Sword and Dead".
The apes are kinda angry and are thinking they want a planet all to themselves.
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