Kyuukyoku Shinka shita Full Dive RPG ga Genjitsu yori mo Kusoge Dattara

Hiroshi Yuuki, a high school student, was looking for a way to escape his stressful life. So, he decided to dive into the world of full-dive RPGs. One day, while looking for a game at a shop, he meets Reona Kisaragi, the beautiful clerk of the store. She convinces him to buy Kiwame Quest, an old game with an overwhelming 10 sexdecillion branches of possible story scenarios, which boasted about its ultimate realism.

When he first plays the game, Hiroshi is impressed with its realism. Unfortunately, he triggers a series of misfortunes. Despite his hatred for the game, Hiroshi keeps coming back to it. He now has just one goal, to beat the game and make it out alive.