Cognition refers to the human perception of the world and the understanding of phenomena as "reality." The Phantom Thieves of Hearts seek to quench the desires of villains by seizing secret treasures, forcing them to confess their crimes and repent. Mitsui Tsubasa disagrees. He believes such immense power is wasted on just a few villains. He'd rather use cognitive science to reshape the world. By eliminating all the "bad guys" who oppose him, a perfect world where only "good guys" exist will emerge. He invests in a pharmaceutical research institute for Takemiya, enlists An Takamaki as a brand ambassador, and with the help of Futaba Sakura, builds the ctOS system, manipulates the sports world to make the Yoshizawa sisters dance for him, and becomes the new "master" of the Velvet Room. The world offers countless pleasures, but Mitsui Tsubasa simply seeks to satisfy his own petty collecting urges and embrace everything he loves. No matter how capricious he may be, this world is his. At the end of the story, he wants to witness a spectacular performance. Atop this mortal realm, under the gaze of all, he will face the final battle between humanity and the gods, alongside the Phantom Thieves of Heart, the brave men who aspire to save the world. "Cheer up, JOKER! You have been granted the honor of competing with the gods!!!"

Leo is a simple, pure, and easily satisfied person. Unlike those who like to save the world, he only pursues two small things in his life - money and immortality.

But even such humble and harmless requests are obstructed by many "big men", making him unhappy.

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Arasaka Saburo, Batman, Iron Man, Black Panther... and other names are all recorded in his little notebook, which is really very - very - very annoying!

And that damn Joker, he hates the Joker!

He swore that if he could control Arkham Asylum one day, he would enforce the policy of "lobotomizing the brain when entering prison" and let those damn guys spend their old age in the ward forever!

Finally, he would like to praise his dear V (Vivian), V (Vera), and V (Veronica).

They come from different backgrounds, from the streets, the wilderness, and the company, but they are equally gentle, virtuous, beautiful and kind. Especially Vivian, who came from the streets. He loved her more than anything else, not because she was crackling bones behind him...

"Have you finished writing your suicide note?" Vivian smiled, "When you're done, go on your way - scumbag!"