At school, Lala Satalin Deviluke unveils her new invention, Nyan-nyan Copy-kun, a catlike robot with the ability to make perfect clones. However, all hell breaks loose when the robot electrocutes Rito Yuuki and runs away, continually creating multiple clones of him. With countless Ritos chasing after the robot, the outlandish Sainan High School becomes even more salaciously chaotic. [Written by MAL Rewrite]