Gibiate

In 2030, Japan is ravaged by a virus that has spread worldwide. Those infected transform into monstrous creatures whose forms vary depending on age, sex, and race. Known as "Gibia," the virus takes its name from the sheer diversity of mutations it produces. Amid this ruined landscape, a samurai and a ninja suddenly appear-having traveled from the early Edo period. With the aid of a doctor searching for a cure, they fight their way through relentless Gibia attacks and bands of outlaws who prey on travelers for supplies. Surrounded by threats, their journey is fraught with danger at every turn.