Amatsuyu Jouro Kisaragi is a completely average second-year high school student who has two dates over one weekend⁠—with the student council president Sakura Cosmos Akino on Saturday, then with his childhood friend Aoi Himawari Hinata on Sunday. Sadly for Jouro, both girls proclaim their love for his best friend Taiyou Sun-chan Ooga, the ace of the baseball team. Accepting each of their requests for advice and guidance, he is now responsible for helping the two girls win the heart of the same guy. Unbeknownst to his friends, Jouro's friendly and obtuse image is all but a ruse designed to cast himself as the clueless protagonist of a textbook romantic comedy. A schemer under his cheery facade, he makes the best of this unexpected turn of events with a new plan: get Sun-chan to fall for either Cosmos or Himawari and take the other as his own prize. But Jouro's last-ditch effort is threatened by the gloomy, four-eyed Sumireko Pansy Sanshokuin, who surprises Jouro with not only her knowledge of his secret personality but also a confession to the true self he hid for all this time. Stuck in this hilariously messy situation, each of the five students must navigate countless lies, traps, and misunderstandings to come out on top.

Phantoms: supernatural entities such as ghosts or youkai that, until recently, were thought to be superstition. However, when a virus that infects the brain spreads throughout society, people's perception of the world changes as the mythical beings are revealed to have been living alongside humanity the entire time. This virus has also affected those of the next generation significantly, allowing them to develop special abilities that they can use to fight against dangerous phantoms. Haruhiko Ichijou and Mai Kawakami are two of those that were granted such power—Haruhiko wields the ability to summon and seal phantoms through drawings, while Mai imbues the power of the elements into martial arts. Together, along with the friendly phantom Ruru, they form Team E of Hosea Academy, which is dedicated to dealing with these often mischievous beings. In a world where the real and surreal intertwine, they handle the everyday troubles caused by phantoms.

Now that Koyomi Araragi and Hitagi Senjougahara have graduated, very few familiar faces remain at Naoetsu Private High School. One of these is Suruga Kanbaru, holder of the Monkey's Paw. When she begins to hear talk of a mysterious being known as the Devil who will magically solve any problem, Kanbaru immediately thinks these rumors are about her and decides to investigate. She discovers the Devil is actually Rouka Numachi, a former basketball rival from junior high who is no longer able to play due to a leg injury. Rouka provides free advice to those who seek her out. Acting as a collector of misfortune, she enjoys relieving the stress of her clients by providing them with the false hope of having their problems solved. Although Kanbaru sees no real harm being done, she reprimands Rouka for lying and heads home, relieved she is not the cause of the rumors. But she may have a reason to worry after all: she finds that her left hand has reverted back to its human form.

Sakura Minamoto dreams of becoming an idol. Unfortunately, reality hits her like a truck, and she dies in a sudden traffic accident. Ten years later, she wakes up in Saga Prefecture, only to find herself a zombie with no memory of her past. While still coming to terms with her demise, she meets a man named Koutarou Tatsumi, who explains that he has resurrected her and six other zombie girls from different eras for the purpose of economically revitalizing Saga by means of an idol group. Assuming the role of an abrasive manager, Koutarou begins scheduling events; the girls go along with it, eventually deciding to name their idol group Franchouchou. An absurdly comedic take on the idol genre, Zombieland Saga tells the story of Franchouchou's heartwarming struggle to save Saga Prefecture while hiding their zombie identities and rediscovering their past lives.