The people of the kingdom look down on the young Prince Bojji, who can neither hear nor speak. They call him "The Useless Prince" while jeering at his supposed foolishness. However, while Bojji may not be physically strong, he is certainly not weak of heart. When a chance encounter with a shadow creature should have left him traumatized, it instead makes him believe that he has found a friend amidst those who only choose to notice his shortcomings. He starts meeting with Kage, the shadow, regularly, to the point where even the otherwise abrasive creature begins to warm up to him. Kage and Bojji's unlikely friendship lays the budding foundations of the prince's journey, one where he intends to conquer his fears and insecurities. Despite the constant ridicule he faces, Bojji resolves to fulfill his desire of becoming the best king he can be.

They always steal the prey they aim for. That is Phantom Thief Queen. Gender, age, nationality unknown. Together with their partner Joker, RD, they travel around the world on the airship Troubadour. This time, the Queen is aiming for a cursed jewel, the legendary Rose of Linden. A hypnotist, an acrobat, a magician...the talented circus members challenge the Queen! What is their purpose? In order to get back the jewel, the Queen stands up to the challenge in a bold and brilliant way (or disguise). Nothing is impossible for the Queen!

It adapts the story from volume 12 (chapter 98 onwards) of the manga series "Demon Slayer: Kimetsu no Yaiba" . The story takes place in a new setting - Tanjiro arrives at the "Swordsmith Village." After the death of Upper Moon Six and Daki, a vacancy appears among the upper moons, and Muzan Kibutsuji summons the remaining upper moons to the Infinity Castle. Muzan is furious about the vacancy and believes that the upper moons should do everything in their power to find the "Blue Spider Lily" and eliminate the Demon Slayer Corps. As a result, Upper Moon Four, Hantengu, and Upper Moon Five, Gyokko, are dispatched to carry out the mission. Meanwhile, Tanjiro, who has been recovering from his injuries at the Butterfly Estate for two months, learns that Kozo Kanamori, the swordsmith, has refused to make him a new sword. Following the advice of the Hashira, Shinobu Kocho, Suma Nakahara, and Kiyo Terauchi, Tanjiro travels to the Swordsmith Village to conUpon arrival, he encounters the Love Hashira, Mitsuri Kanroji, and the Mist Hashira, Muichiro Tokito, as well as Genya Shinazugawa. Tanjiro and his companions are about to embark on a new battle. The opening theme song "Ketsui no Hikari" is performed by MAN WITH A MISSION and milet. The lyrics and composition are by Jean-Ken Johnny, with arrangement by MAN WITH A MISSION and cooperation by Chisato Ichinose. The ending theme song "Koikogare" is also performed by MAN WITH A MISSION and milet.

Touya Mochizuki grows accustomed to his new life in another world. Armed with his trusty smartphone, the teenager accepts small quests at his leisure while spending time with his new fiancées: Yumina Urnea Belfast, Yae Kokonoe, and twin sisters Linse and Elze Shileska. But even in a relaxing environment, Touya is only beginning to understand the responsibilities that come with these engagements. In addition to his romantic woes, the elder fairy Lean wishes to locate the remaining pieces of Babylon, the floating island that the mysterious Professor Regina Babylon created five thousand years ago. Touya reluctantly accepts her request and seeks out the teleportation circles that will lead to the islands. However, strange monsters have emerged—possibly powerful enough to destroy the world. In order to save the second life he was given, Touya must weaponize ancient technologies to fight these monsters—all while balancing his overwhelming number of relationships.