Rui Kamishiro is a good-natured genius. He carefully makes each show the best it can be, using his talent for technology and ingenuity. While testing one of his inventions something went wrong and he turned into a fluffy cat indefinitely. Rui texted Tsukasa on the phone with his paws and asked to come, unfortunately, Rui can only purr and meow now. Let him understand human speech, and he will be a very affectionate cat.