With no more death flags in sight, personable but dense Catarina Claes is finally able to lead a peaceful life surrounded by all of her friends and family. For that reason, she is determined to enjoy the school festival to the fullest without any concern on her mind. Unbeknownst to her, however, the story of Fortune Lover—the game she used to play—has yet to end. Even more characters make an appearance, each with their own agenda to fulfill, and new mysteries await Katarina and those she loves. Will there be any way to avoid a bad ending when Catarina cannot remember what happens next?

With the tumultuous cultural festival behind him, Masamune Makabe continues his efforts to carry out his revenge: to make the Cruel Princess Aki Adagaki deeply fall for him and then immediately dump her. As his class is going on a trip to Paris, widely known as the City of Love, Masamune has the perfect opportunity to get even for his childhood heartbreak. Before Masamune can impress Aki, the two meet Muriel Besson, a French high school otaku who aspires to create a romantic comedy manga series. Muriel believes Masamune is the ideal model for the protagonist and asks for his help. The boy reluctantly agrees, dragging Aki along to provide inspiration for the love interest's character. But to do so, the two must show Muriel what Japanese love is like. To make matters more complicated, Kanetsugu Gasou is masquerading as Aki's childhood friend, Masamune, to trick and use her. With mix-ups and love rivals galore, Masamune's revenge is proving to be quite the difficult task.

Still in pursuit of her ambitious goal, ingenious arms dealer Koko Hekmatyar, inexpressive child soldier Jonathan “Jonah” Mar, and the rest of their squad continue their mercenary activities. From professional assassins to private militaries, the group's work constantly puts them in the face of danger. But internal conflicts soon arise after Renato R Socci, one of Koko's bodyguards, is revealed to be an undercover agent for Operation Undershaft—a plan devised by the CIA to infiltrate HCLI and exploit Koko as a tool. Shocked by his betrayal, Koko's leadership is needed now more than ever to rally her squad and rebuild their foundation of trust before they are torn apart. Jormungand: Perfect Order follows Koko and the rest of her crew as they take on persistent adversaries, overcome internal struggles, and make Koko's vision of world peace a reality—where everything is in perfect order.

An apocalyptic event has ravaged Japan, leaving nothing but endless sandy plains behind, and a strange rusting disease terrorizes the remnants of civilization. According to the government, the horrific state of the new world is the result of mushroom spores being spread by the likes of Bisco Akaboshi, labeled the Man-Eating Mushroom. But Bisco would beg to differ. In reality, he is a Mushroom Protector, determined to uncover the legendary Sabikui mushroom—said to be the ultimate cure for the rusting disease. Joining him on his quest are his giant crab Akutagawa and the kind doctor Milo Nekoyanagi, who is actively searching for a rust poisoning treatment for his sick sister. Despite the prejudice aimed toward him by the common folk, Bisco refuses to give up on his quest to purify the rotting world.