In the year 20XX, the world was on the brink of collapse due to the sudden arrival of mysterious invasive lifeforms known as "Magatsuhi" and the virus they spread.

With conventional weapons proving useless, the government assembled civilians who adapted to the virus and gained supernatural abilities to form the Anti-Hazard Agency "Totsuka." You are an Adapter assigned to this ragtag team.

Your mission is to reclaim facilities occupied by the Magatsuhi and rescue citizens under attack.

【Magatsuhi】

Invasive lifeforms incapable of communication. They are rapidly growing larger and more ferocious, and conventional weaponry is ineffective.

【Magatsu Virus】

Infection causes symptoms such as fever. Adapters who overcome the toxicity undergo mutations in their cells and nervous systems, gaining superhuman abilities.

【Adapters】

Those who have adapted to the virus, resulting in altered and enhanced cells and nerves. The nature of the enhancement varies by individual. (Physical abilities, intellectual enhancement, the ability to use magic-like powers, etc.) Durability and motor skills are generally boosted.

【Anti-Hazard Agency Totsuka】

A makeshift organization composed of Adapters. The numbers are still small, and the 1st Unit leads the vanguard. Because it is a makeshift unit, uniforms are not provided. Only portable items such as weapons, magazines, and medicine are issued.

【Guest】 An Adapter. After a sudden official document arrived, you were whisked away and became a member of the 1st Unit before you knew it.