Riko Kozakura never works overtime. Working with ruthless efficiency and refusing to participate in any after-work socializing unless it is absolutely required, she always makes sure she can get home as soon as possible so she can focus on her one true passion—video games. Because of her intense drive and guarded personality, her coworkers are shocked when she of all people is the one to take in a stray kitten found in the company parking lot—as is Kozakura herself.

Despite not knowing the first thing about looking after a cat, Kozakura is soon intent on "maxing out" the kitten with the same care and attention she gives to her video game characters. As they bond over each other's antics, it is not long before neither of them can imagine life without the other.