
If you're looking for manga similar to Kill Time Online: Munou Shounen wa Uketsugishi Kami Skill de Dennou Sekai wo Musou suru (Light Novel), you might like these titles.
Raid, a newbie Edge Punisher in The World R:2 decides to sell all of his gear and items in order to buy a rare sword. Unfortunately the sword draws the attention of a group of PKers who decide to kill him and steal the sword for themselves. Dead, naked, and penniless it seems that it's all over for Raid, when he is suddenly saved by a group of players from the Seventh Division of the guild Moon Tree.
Average high-school student Midori Shinomura falls mysteriously ill. While she wastes away in a hospital, she learns of another Midori - a fighter of terrible skill in the online game known as The World. There is a strange and close connection between both Midori Shinomura and game-Midori. With the sanity of both girls on the line, game-Midori will try to solve the mysteries of her past, and perhaps save the real-world Midori in the process.
Gamer Ren Takashiro loves nothing more than taking junk job classes and turning them into the new meta. So when he enrolls at a special school that incorporates online gaming into their curriculum at the invitation of his longtime gaming buddy, Akira, Ren of course decides to be a symbologist—supposedly the weakest class of all. He quickly gets to work making it a force to be reckoned with, but little does he know he’s in for a surprise he never expected... It turns out that his pal Akira is actually a cute girl!
Follows a dull high school student named Hiro Yuuki when he is tricked into joining a full-dive VR role-playing game. The game, Kiwame Quest, is promoted as "more real than reality" with mind-blowing graphics, impressive NPC behavior, and even the scent of foliage and the sensation of wind blowing against your skin. Unfortunately, the game is already a virtual ghost town, after being flooded with player complaints that the game is little too realistic for its own good. Its quests are nearly impossible to clear, since players have to be as physically fit to complete them as they would in real life. Players feel actual pain when they get hit, and puncture wounds takes days to heal. The only reward is the mere sense of accomplishment. It is the complete opposite of a casual pick-up-and-play game, but Hiro vows to beat this most realistic (and most stressful) game ever.