Call of Duty is a popular video game series known for its realistic depictions of military conflicts. While the games are often inspired by real historical events and settings, they are not based on specific true stories.

Call of Duty: Black Ops Cold War's campaign is set during the Cold War in the early 1980s. It follows Green Beret turned CIA SAD/SOG officer Russell Adler (Bruce Thomas) and his mission to stop an international espionage threat known as Perseus (William Salyers) in 1981. The story is inspired by actual events.

Her psychic powers mutate the smallpox virus into a new strain of virus, called the "ring virus", one that causes anyone who contracts it to die, seemingly of fright, within a week. By Ring, in 1991, the Izu sanatorium, including the well that Sadako was thrown into, has been rebuilt into a mountain resort.

Sadako found out that she had leukemia. At that time they called leukemia the A-bomb disease . There was a low survival rate for 'A-bomb disease and Sadako was very scared. During Sadako's stay in the hospital, her best friend, Chizuko, came to visit her.