(W/A) Kakeru. The Deepest* Most Unknowable Dungeon is the deadliest stretch of ground in the new world into which Jean has been reincarnated. Even the top-ranked Holy Saint Slaughterer* the Queen of Darkness* and the Bow King are unable to defeat the demihuman hordes* or conquer the dungeon. But using Earth knowledge from his former life* Jean may just be able to develop the ultimate weapon an arrow that can pierce any armor and change the game forever!