Story Synopsis

Forgetfulness has become a serious disease for the people in this world. As a result, human discovered a way to stop “forgetting”.
Scientists indicate that certain monsters called ”mementos” are responsible for devouring people’s memories.
There are two ways to protect yourself from the “mementos." One is by taking a newly invented medicine prescribed by the specialists. However, there are rumors saying that the medicine might cause side effects to the human body.
The other way to save memory is to hire a mercenary group that are capable of killing ”mementos.”The story unfolds during a mission of one of these mercenaries.