The games are primarily walking simulators; the player moves main character BB around environments and reads her thoughts on the current events.

The games follow BB, a college student living in an apartment in XX City with her older sister ZZ, as she investigates various strange events for her zine.

BB gets a job as a cold caller at the insurance company Life Contracts, where she notices several strange occurrences, such as all the employees being covered in sheets, a heavy police presence, and a welcoming party for the Killer.

BB discovers that Tammy is actually the ghost of a schoolgirl drowned by the Killer, who since her death has been transforming buildings into water parks to fulfil her vision of the new economy.

BB is conscripted into the city's immersive theater production of "Melmo the Wanderer", where she plays "Potsy the Mop Girl", a character who has one line before being killed.

Bosso reveals that the wealthy owners of the city fund the immersive theater and the murder of its audience to satisfy their desire for bloodshed.

Trying to find answers, BB goes to a retro convention after learning that Blue D Hans' record company's remaining assets are being sold off there, and stumbles upon the Weepster, a Crime Wave artist who murders his scene rivals.

Waking up on the beach with the Weepster's clothes lying abandoned next to her, BB reunites with ZZ, who is selling the Blue D Hans records to a buyer who wants to meet them in person.

The buyer turns out to be Blue D Hans himself, who explains his philosophy of the "counterworld", a negative of the regular world, to BB, before forcing her and ZZ to perform a beachfront concert with him.

In a bathroom, BB encounters fellow zine author CC, who tells her to meet at the same place the next day to learn the truth behind the Resort.

The next day, the bathroom is empty but BB discovers a secret passage behind a mirror, which leads to a surveillance room containing a dossier on government agent "The Spook", as well as instructions on how to escape the Resort.

Marcie is consumed by the Spook, seeking validation and identity from its collected data; BB refuses to follow and wakes up as the Resort collapses.

After the release of Bloody Night IV other studios made their own films featuring the BB character, who gradually morphed into a murderous villain.

After a reactionary speech by an immersive theater actor in character as Mappy, the party's guests - dressed as serial killers - start murdering people.

The Mappy actor accidentally shoots himself with a prop gun, believing it to be unloaded, causing Bosso to blame BB for the theater's troubles and attack her.

BB escapes Bosso, but is captured by the police, whose leader, Cool Policeman, explains that they loaded the immersive theater's prop guns to create a pretext for attacking it and seizing control.

The player passes beneath an apartment where the real BB and ZZ are attempting to begin a career as country singers in order to get out of XX City.

[1] Brendan Caldwell, writing for Rock Paper Shotgun, praised the series' "combination of DIY MS Paint visuals and a surreal comic voice" and said that "I could basically pick any dialogue box that appears in any of these games and it would have something worth smiling at, or frowning at, or feeling something at".