Ever 17 -the out of infinity- Welcome to the deep place

In the year 2017, the underwater theme park LeMU is flooded during a catastrophic accident, trapping a group of visitors and staff deep beneath the ocean. Among them are the protagonist, a young man suffering from amnesia, and several others who must fight for survival in the isolated facility.

As they struggle to escape the sinking structure, they uncover strange phenomena and hidden secrets within LeMU. The pressure of their dire situation tests their resolve, while the mystery of the protagonist's lost memories and the true nature of the accident begin to unravel, leading to a tense race against time.