"U" is a popular social media platform where people can create a virtual persona and start a new life. Among its five billion users, one newcomer is quickly gaining attention: Belle, a beautiful singer whose alluring melodies slowly capture the hearts of the masses. But in this space where everyone hides behind an avatar, curiosity arises over who the mysterious girl truly is. Suzu Naito—a shy girl from the countryside—can no longer sing following past trauma, all her efforts resulting in breakdowns and illness. However, when Suzu joins U, she is once again able to project her voice. Under the alias "Belle," her vocals soon go viral, receiving both love and hatred. Meanwhile, rumors spread of a chaotic beast within U, known only as "The Dragon." After a chance meeting during her concert, Belle finds he is not as evil as the stories suggest. Now, both online and in the real world, Suzu has to face the struggles of identity, fame, and opening one's heart.

U.C. 0097, one year after the opening of "Laplace's Box." Despite the revelation of the Universal Century Charter that acknowledges the existence and rights of Newtypes, the framework of the world has not been greatly altered. The conflict later dubbed the "Laplace Incident" is thought to have ended with the downfall of the Neo Zeon remnants known as the Sleeves. In its final battle, two full psycho-frame mobile suits displayed power beyond human understanding. The white unicorn and the black lion were sealed away to remove this danger from people's consciousness, and they should now be completely forgotten. However, the RX-0 Unicorn Gundam 03, which disappeared two years earlier, is now about to show itself in the Earth Sphere once more. A golden phoenix... named Phenex.

After the fierce battle on Rakuyou, the untold past and true goal of the immortal Naraku leader, Utsuro, are finally revealed. By corrupting the Altana reserves of several planets, Utsuro has successfully triggered the intervention of the Tendoshuu’s greatest enemy: the Altana Liberation Army. With Earth as the main battleground in this interplanetary war, Utsuro's master plan to destroy the planet—and himself—is nearly complete. An attack on the O-Edo Central Terminal marks the beginning of the final battle to take back the land of the samurai. With the Yorozuya nowhere in sight, the bakufu all but collapsed, and the Shogun missing, the people are left completely helpless as the Liberation Army begins pillaging Edo in the name of freeing them from the Tendoshuu's rule. Caught in the crossfire between two equally imposing forces, can Gintoki, Kagura, Shinpachi, and the former students of Shouyou Yoshida put aside their differences and unite their allies to protect what they hold dear?

Throughout Shibuya, a series of murders dubbed the "New Generation Madness" gained widespread attention As these crimes gained infamy, they became a hot topic of discussion among the people of the area. Nonetheless, these "New Gen" murders do not capture the interest of Takumi Nishijou, a high school otaku who frequently experiences delusions and feels that he is constantly being watched. Having no concern for the real world, Takumi spends his time playing online games and watching anime. However, his ordinary life is disrupted when he receives a horrifying image of a man staked to a wall from a user named Shogun. After calming himself at an internet cafe, Takumi sees the exact same murder scene as the image portrayed happen right before his eyes, along with a pink-haired girl covered in blood calling out his name. Conflicted with the nature of reality, Takumi finds it difficult to judge where to place his trust as he gets caught up in the "New Gen" murders, believing that the murderer is out to get him.