Taking place after the events of Heaven and Earth and before Exodius, Behind the Line depicts the moments of boys and girls after Soushi Minashiro returned home.

Demonic Vice-Commander of the Shinsengumi, Toushirou Hijikata, acquires a cursed sword—one which completely rewrites his personality, morphing him from a hard-boiled, no-nonsense cop into a hopeless otaku. As he struggles to break the curse, an ambitious new member of the police force, Itou Kamotarou, seizes the opportunity to depose Hijikata in his bid for power within the organization. However, Itou's scheme is revealed to be more devious than anyone imagined, and the very existence of the Shinsengumi is thrown into peril. In another time and place, the Yorozuya squad is suddenly greeted by a potential new recruit. Before them is a mysterious young woman named Pirako Doromizu who hides a penchant for extreme violence behind her smiling, enthusiastic exterior. However, unbeknownst to Gintoki and the others, Pirako has strong ties to one of the ruling figures of the Kabuki district of Edo, and her arrival sets off a chain reaction that throws the inhabitants of the district into a civil war.

The player Dongdong mistakenly entered the game world "Azure" and changed into the skeleton, the weakest wild creature. The unidentified Dongdong used his years of gaming experience to amass a band of wild monsters early on. He met the main character Bubble, made a deal with her to become her strongest pet, and then set off on an amusing and thrilling adventure with Bubble and his new pals in "Azure." The phenomenon of NPCs and wild monsters in the game gradually awakening and yearning for the human world was also identified at this time by Dongdong. To learn the truth and get back to your regular life. The main character group, lead by Dongdong, as well as awakened NPCs, regular players, game developers, and other entities started to debate how the two worlds were connected.

A series to commemorate the 10th anniversary of the "Gundam Build" franchise. A new Internet service has been born in the world of Gunpla. Within the Metaverse realm, the user can control their own avatar, interact with other users, play Gunpla Battle, and purchase actual Gunpla. Rio Hojo is a boy who has dived into this new world. Studying Gunpla building techniques in the real world with Seria Urutuski, and absorbing Gunpla Battle know-how from Mask Lady in the Metaverse world, he has been honing his skills day by day. After completing his own original Gunpla, the Lah Gundam, Rio happens to encounter some past champions of Gunpla Battle in the Metaverse realm.