Main Story

The **Main Story** is the first and main campaign of Adventure Mode of The One Billion Survivor. There are a total of eight stages and a tutorial level playable in this mode, each having their own song and with six levels.

## Overview

At the very start of Main Story, the player starts with a cutscene about the events that happened before The One Billion Survivor took place before rewarding with Stage 0 for the first time. The first level in each area (or known as a "Stage") contains an introduction throughout the first section of a level.

## Plot

The Main Story starts with a view of a boarding aircraft during a long flight between Tokyo and Doha and then the latter to Rio de Janeiro. Suddenly, the aircraft ends up having an unexpected malfunction and the latter smashes down an unknown island that appears to be Rio de Janeiro, before revealing it to be a strange country that is now known as Survival Land. The player character, having emerged and survived the aircraft's downfall, starts to investigate the "strange country".

As it turns out, it was later revealed to be a strange metropolis that appears to be normal and formally inhabited by the members of Survival Land, but as the player gets closer to see what's happening, darkness shrouds the Earth, creating a large vortex. The darkness dissipates after that and the inhabitants of Survival Land are now missing. This causes the player character to start their journey.

At Stage 0, the player starts their journey on a secluded island where it houses a hybrid of a video game station and a theater. This lead to the player finishing the tutorial moves and skills, causing the player to start their main adventure at Stage 1. At Stage 1, the player goes on a solo expedition (or real expedition if it's multiplayer) to seek through the mysteries of the country, starting with the plains while going into one of the country's forest caverns and heading back up, but they inadvertently end up in a taken factory and they are forced to fight a formidable opponent with enhanced armor. Eventually, the player is able to defeat him with their dancing skills whilst also combating the enhanced soldier. The soldier lies defeated, marking his surrender. At Stage 2, the player finds out they're in a fantasy realm filled with cubical platforms, terrain, and spacing. The player tries to continue forward but is interrupted by a pixelated goop of a strange, red substance. When the player tries to touch it, it became immediately sentient and starts following after the realm's unique platforms. This ultimately lead to a mysterious pathway that the player is able to confront that virus. It transforms into Lord Pixel Virus and is sooner or later defeated by the player, dissipating quickly into its tiny remnants. At Stage 3, the player plummets down into a strange, shifting island of what appears to be a real-life city. There, the player can find hidden treasures in that one island. However, the player is stopped by NovoRiot and RoboRiot, both of which are robotic vehicles. RoboRiot is made out of a car while NovoRiot appears to be a life-sized mech. The player is able to defeat them both and continue onward. At Stage 4, the player explores a mystical forest, only for it to be controlled by a mysterious deity of some sort. At Stage 5, the player ends up in a crystalline world, only for it to reveal that it is a large island that almost looks like a country but is inhabited by its own denizens, in which they're called Crystal Lites. At Stage 6, the player enters a mysterious, foggy, landscape with a futuristic setting. At Stage 7, the player encounters a cursed town that has been destroyed by an enigmatic sorcerer named Murdoch. Lastly, at Stage 8, the player finally reaches the tower of erupting doom, the Darkness Corporation, held by its leader, the Hacker. The player is eventually able to defeat him for good and then the storyline ends.

## Stages

The One Billion Survivor has a level selection where it consists of eight Stages that are roughly named from the songs of a rhythm game called Pump It Up. The menu can be switched to World Mode, to which the campaign will appear as a world map similar to most Nintendo games, while it can be switched back to Selection Mode, where it appears to be a selection of buttons that links to a specific Stage.

Unlike most other video games that have a typical map of levels, The One Billion Survivor uses a strict variation of this type. Each level has to be completed in order to advance to the next one, and completing a boss level will advance the player to the next Stage. For example, completing level 1-1 unlocks level 1-2, and so forth.

## Levels

Each level has a unique name while every Stage has a unique song and is used on every level in that Stage.

## Notes

* There is no boss battle fought in Stage 0, while Stage 8 has two bosses encountered at the last two levels of the last Stage one before the dance battle and one during the dance battle. All boss battles are fought in Stage 9, the Boss Rush Nebula.
* Finishing the tutorial level will unlock the first unlockable Pump It Up team, called Team SHiNY Blues.