Adventure isekai ⚔ (NO Harems)

The main character reads web-novels as a hobby and when a particular story is about to reach its conclusion, he gets a message from the author thanking him for reading. And then the world around him suddenly morphs and hes thrust into the novel. Too bad its about the apocalypse.
(This one is SO good, I hope it gets animated someday)

Birth of a Hero is an ordinary novel where the kind protagonist, Choi Han, loses everyone he loves and falls deep into desperation. In order to get revenge, he leaves his home and heads to a nearby city where he beats up a low-life, drunken noble who was getting on his nerves, a barely relevant moment for this soon-to-be hero's journey.
Unfortunately for Kim Roksu, he wakes up as Cale Henituse—the same drunkard noble who is destined to be beaten by Choi Han.

Sejun, your average Seoul underdog, didn't expect to grow tomatoes full-time when he stumbled into the mysterious dungeon full of monster quests and extravagant rewards. Yet, there he was, as a farmer growing and selling cash crops while clearing numerous quests that came his way. Will Sejun make it out of the dungeon with the plush rewards he hoped for? At least he has what it takes: optimism, resourcefulness, and a group of loyal furry friends.

One day, Joo Kang-hyun, a stranger who fell into the world of martial arts, rose to the position of Heavenly Demon after going through countless hardships. However, he always missed his hometown, the 21st-century Republic of Korea.

I was reincarnated as a grimoire with all the magical knowledge of this world. Anyone can become a legendary arch-mage with my help. Read me and I’ll give you endless power.

Sei, a 20 year old office worker was summoned to a different world after finishing some overtime work. Immediately dismissed as not being the Saint due to arriving with another young girl, Sei left the royal palace and concealed her saint title. She started working at a laboratory where she made potions and cosmetics. She used her magic to grant people’s requests and slowly people began suspecting that she was a saint…

Amami is a kind doctor who always puts other people first. Struck by lightning and knocked unconscious, he woke up to find himself in a parallel world peopled by beast folk, with a chimera stalking around to boot! How will Amami fare as a doctor teleported to a strange world where technology is virtually nonexistent, and medicine is treated like magic?

Mukouda Tsuyoshi, summoned from modern Japan to a different world of sword and magic. Upon arriving, he is found to have the skill 'Online grocery' and dismissed as being useless. Little did anyone anticipate just how useful his skill truly was...

Alicia is an orphan living in Ciel, a world of swords and magic. One day, she discovers that she is "the heroine of an otome game".
Alicia decisively rejects the heroine's role as "nonsense". Taking the name "Aria" as an adventurer, she gradually grows into the "Ash-crowned Princess of Slaughter" who wields multiple weapons and magic!

Minami Satoru who lived a normal life was stabbed by a passing ruffian, closing the curtains of the 37 years of his life. It should have been like this, at least. But he suddenly found himself not being able to see nor hear.. In this kind of state, he became aware of the truth: he had reincarnated into a slime.