Game-world Isekai (Adventure) (No Harems)

Gray, the B-rank adventurer, was a background character in the RPG known as Bright Fantasy …or at least that’s what he thought. After saving orphans from being attacked by goons, he resolves to provide for them as a father. But one of the orphans is Iska, the other world’s future hero, and his choice will greatly change its destiny.
(I LOVE this one, its so heartwarming )

One day, a gamer played video games until he fell asleep…and when he woke up, he found himself in the game world–as a skeleton! Equipped with the powerful weapons and armor of his avatar but stuck with its frightening skeletal appearance, Arc has to find a place for himself in this new, fantastical land.

Han Xiao, who boosted accounts for users of the online game Star Ocean, traveled through time via unknown power and landed in the world created by the beta version game. He became an NPC with a player's panel. Without hesitation, he chose his favorite career and became a mechanic. Using his skills learned from the previous life, he accessed instances ahead of others and played his role as an NPC to fool players

When I woke up, I had reincarnated into the world of a game I played in my past life. And what's more, as a monster that's hostile to humanity! It couldn't be helped, so I just lived quietly so humans wouldn't find me, but...

The heroine, Noa, who was my oshi in my past life, was collapsed near my home!!

Taepung Shin knows every nook and cranny of his favorite MMO video game Paradiso like it was the back of his hand! However, his gaming adventures suffer an abrupt end after his untimely death. But this is not his last hurrah since he’s reincarnated as Jared, a delinquent lord of a frozen province… in Paradiso!

After possessing the body of a berserker in a game, overcoming countless hardships, finally killing the great demon, and at last reaching the ending, the text the man was confronted with was this: [ New Game + ] “No… Fuck….”

Obsessed with the clicker game Infinite Diamonds for over a year, Jaehee finally reaches the ultimate in-game achievement — only to suddenly find herself in the RPG gacha game Terrarium Adventure! Why was she pulled into the game, and how can she get out? For now, she has no choice but to explore!

Minjoon, a normal office worker, wakes up inside the game he was reviewing for his friend. It's not his fault the trailer was so boring it put him to sleep! Bewildered, Minjoon is tasked with summoning a hero to guide. The hero certainly looks strong, but he seems to be less useful than expected.

(This one is BL)