Before Mii-chan turns eighteen, she'll need to decide how to live the rest of her life--cat or human? Her emotions are in total turmoil! Her adoptive roommate Iori is totally oblivious to her feelings, and he hits it off with the cat café manager Makio, who, in an amazing twist, has adopted Mii-chan's sister, Tamaki! Mako takes them all on a fun-filled afternoon trip to the lake and explains the ins and outs of cat-girl care to Iori while the sisters play.

Cat girls don't have it easy--someone's been after Mii-chan. In fact, Iori turns his back on Mii-chan for just one moment during a hike, and a man grabs her! Who kidnapped Mii-chan? Will Iori and Tamaki be able to find her?!