The Hundredfold Haven (Hyakujuu no Ansokusho)

When 18-year-old high school student Akira Sakamoto heroically saves a mother and daughter from a speeding car, he’s thrust into an alternate reality: a game known as the Fortress of the Fallen. Now trapped in the treacherous realm of Hyakujuu no Ansokusho, Akira battles fierce monsters and earns powerful rewards as he climbs the hundred-floor Tower. But as he finishes the tutorial phase of the game, Akira discovers the system has double-crossed him, leading to unimaginable consequences. Can Akira outsmart the game and find a way back to his world, or will the system's treachery be his undoing? Dive into this thrilling saga where bravery meets betrayal, and nothing is as it seems.