Immoral Quartet ～4人の性欲が絡み合う、愛と寝取られの物語～

Suddenly, one day, humanity is headed for extinction.
A large number of people are dying every day for unknown reasons, and the everyday life that had existed until then is disappearing.

A month after the event, only four men and women survive on an island 200 kilometers south of the capital.

the remaining students gather at the school building and work together to survive.
During the day, they work hard to gather information and secure food, and at night, the four of them gather together to eat.
It was only natural for them to develop special feelings for the opposite sex as they slept and ate together.

However, their uncontrolled sexual desires are slowly changing their relationship.
The apocalyptic world exposes their true nature.