The Two of Us from Some Time Ago by Hanii

The Tale of Beast Nation by Yuichi

L.A.G, an unknown space where humans use abilities or skills through awakening, monsters appear on each floor and room, and missions are given accordingly.
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The goal here is to reach the bottom. The protagonist repeats death and life countless times in the unknown space L.A.G. However, in this life, he has the ability to own unlimited passive skills and finally has a chance to escape there.
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However, unlike what he has been through so far, he will not know an inch of the future as L.A.G continues to change. This is a desperate survival story in which no one can be trusted and continues to survive the hellish L.A.G, where there is no end in sight, and fights for escape from the bottom.