Seinen

It is the near future. After a young man woke up from a deep sleep for his sclerosis, the world completely changed.

A 34-years-old NEET otaku is chased out from his house by his family. Unattractive and penniless, he finds that he has reached a dead end in life and realizes that his life actually could have been much better if he had made better choices in the past.
Just when he was at the point of regret, he saw a truck moving at a fast speed straight towards three high schoolers in its path. Mustering all the strength he had, he tried to save them and ended up getting run over by the truck, quickly ending his life.
The next time he opened his eyes, he was already reincarnated into a world of sword and magic as Rudeus Greyrat. Born to a new world, a new life, Rudeus decided that, “This time, I’ll really live my life to the fullest with no regret!“ Thus, starts the journey of a man yearning to restart his life.

Sakigake!! Otokojuku (Japanese: 魁!!男塾, lit. “Charge!! Men’s Private School”), also known as simply Otokojuku, is a Japanese manga series written and illustrated by Akira Miyashita. It was originally serialized in Shueisha’s Weekly Shōnen Jump from 1985 to 1991. It is staged in an all-boys school that teaches how to be true men. The students are trained to “revive the Spirit of Japan” and mainly engage in events where they will polish their manhood and push through with their guts.

Monster (stylized as 🢒M⊙NS†ER🢐) is a Japanese manga series written and illustrated by Naoki Urasawa. It was published by Shogakukan in their Big Comic Original magazine between 1994 and 2001, with the chapters collected in eighteen tankōbon volumes. The story revolves around Kenzo Tenma, a Japanese surgeon living in Düsseldorf, Germany whose life enters turmoil after getting himself involved with Johan Liebert, one of his former patients, who is revealed to be a dangerous serial killer.

A gate appears in Tokyo’s Ginza district sometime in the 21st century. From the gate pours out monsters, knights from middle-age Europe, and other fantasy-like beings, and they kill many of the citizens of Tokyo. This event is known as the Ginza Incident.
The government sends a small group of soldiers from the Japanese Self-Defense Forces to the alternate world beyond the gate. Led by otaku soldier Yoji, they find that the villages in the world are being attacked by a dragon. An elf girl who is a survivor from the dragon’s rampage joins the group in their travels across the dangerous new world.

In this new action-comedy, everything about a young man named Saitama screams “AVERAGE,” from his lifeless expression to his bald head, to his unimpressive physique. However, this average-looking fellow doesn’t have your average problem… He’s actually a superhero that’s looking for tough opponents! The problem is, every time he finds a promising candidate he beats the snot out of them in one punch. Can Saitama finally find an evil villain strong enough to challenge him? Follow Saitama through his hilarious romps as he searches for new bad guys to challenge!