Manga for young adult men is called seinen. The term "seinen" means "youth" in Japanese, but we're referring to comics aimed at older guys when discussing seinen manga. You'll find these manga in magazines like Weekly Manga Times and Weekly Manga Goraku. Unlike other types of manga, seinen manga often explores mature themes, has intricate characters, and tells more profound stories. If you're interested, you can check out a list of seinen manga on MyAnimeList.net.

JoJo's Bizarre Adventure

The story revolves around the Joestar family, an influential British clan with a unique ability to confront supernatural threats. They gain special powers and battle evil forces across generations. Each part of the story focuses on a different family member, starting with Jonathan in 1880. Parts 1 to 6 follow a connected and straightforward plot, while parts 7 and 8 occur in a different universe. The title "JoJo" is a clever wordplay using the protagonists' names in each part, and it can be shortened to "Jojo" as a nickname.

Oyasumi Punpun

The manga recounts Punpun's tale, a genuine boy depicted as a 2D caricatured bird. He shares details about his unstable family life, delves into his first love, shows his surroundings, and navigates through his early adolescence with a more or less hyperactive mind over several years of his life.

March Comes In Like A Lion

Rei Kiriyama, a 17-year-old pro shōgi player, resides solo in Tokyo. With no family and few friends, he opts for solitude after separating from his adoptive family, but the loneliness takes its toll. The only people in his close circle are Akari Kawamoto, a young single woman, and her two younger sisters, Hinata and Momo. Through their connection, he begins to find his footing, growing both as a player and a person.

Land Of The Lustrous

The story unfolds in a far-off future where humans are no more. Instead, a new life form, the "Hōseki" or "gems," has emerged in humanoid form. Only 28 of them must combat the "Tsukijin" or "Selenians" from the Moon, who aim to turn them into mere decorations. Each Hōseki is given a specific role, like fighter, doctor, or gunsmith. The main character, Phosphophyllite, is considered weak by others due to having one of the lowest hardness levels.

Black Lagoon

Rokuro Okajima, a young Japanese office worker, is assigned to travel through the Southeast Asian seas to deliver a disc containing confidential and crucial data for his company. However, his journey turns dark when his boat is attacked by a group of freelance pirates hell-bent on retrieving the valuable information. They capture him and bring him aboard the Black Lagoon, an old torpedo boat. Naively thinking his company will rescue him, he remains relatively unconcerned.

Little does he know his superiors have hired mercenaries to eliminate him and erase all traces of the data. In a surprising turn of events, at the end of this remarkable first episode, he decides to leave his life in Japan behind and embark on an adventure with these modern-day pirates.

Drifters

Toyohisa Shimazu, a young samurai participating in the Battle of Sekigahara in feudal Japan, unexpectedly gets transported to another world. Surprisingly, he realizes several famous warriors have also arrived in this new dimension. Now, Toyohisa is thrust into an unrelenting war with many unknown details. He must lead alongside two renowned Japanese historical figures, Oda Nobunaga and Yoichi Nasu. As the story unfolds, more fighters and strategists from different eras, such as Hannibal Barca and Sundance Kid, join the fray.

Bungō Stray Dogs

The story follows individuals with supernatural powers who use them for various purposes like managing a business, solving mysteries, and undertaking missions for an armed detective agency against the port mafia. It focuses on the daily lives of the members of the "armed detective agency." The central plot revolves around a detective agency whose members possess unique supernatural abilities, allowing them to handle investigations too tricky for the police. Nakajima Atsushi, a young orphan struggling for survival, stumbles upon a man attempting suicide by a river. This man is Dazai Osamu, a member of the peculiar agency.

Umineko No Naku Koro Ni

In October 1986, the affluent Ushiromiya family gathered on the island of Rokkenjima, the residence of the family's patriarch, Kinzo. With the family doctor predicting Kinzo's demise in three months, the heirs convene to negotiate the division of the inheritance and determine the next family head. Apart from the Ushiromiya family, the island has several servants and an appointed doctor, including eighteen people. However, a sudden typhoon traps them on the island, isolating them from the outside world. As the family contends with the storm, mysterious events unfold, and people inexplicably meet their demise. The prevailing belief among those present is that the legendary witch Beatrice said to haunt Rokkenjima, might be the culprit behind the unsettling occurrences.

Real

Tomomi Nomiya gets kicked out of high school after a motorcycle accident leaves Natsumi Yamashita paralyzed. Despite being passionate about basketball, Tomomi stops playing. This opens the door for Hisanobu Takahashi to become the basketball team leader. While visiting Natsumi, Tomomi meets Kiyoharu Togawa, who gave up on his handi-basketball team because he thought they were not up to par. Later, Hisanobu gets into a severe accident, and now he's in rehab, struggling to accept that he might have to use a wheelchair forever.

Kingdom

In ancient China, many centuries ago, the tale unfolds with young Shin on his quest to become a Great General under the heavens. Born in the State of Qin, Shin faces numerous challenges in a time marked by internal and external turmoil. The narrative is set during the Warring States period. China was divided into seven kingdoms: Qin, Zhao, Han, Wei, Chu, Yan, and Qi. Through Shin's journey, we also witness the story of Ei Sei, the man destined to become Qin Shi Huang, the unifier of China.

Kaguya-sama: Love Is War

Shūchiin Academy is an esteemed institution where the country's future elites, primarily the affluent, pursue their education. In the high school students' office, Kaguya Shinomiya, the vice president, and Miyuki Shirogane, the president from a more humble background, share a unique dynamic. Though they are mutually attracted, their pride prevents them from confessing their feelings.

Due to the perceived link between expressing love and potential power dynamics, Kaguya and Miyuki believe the first to admit will be the "loser" in the relationship. Thus, their daily lives become a series of intricate plots and strategies aimed at compelling the other to confess their feelings.

Blue Period

Yatora Yaguchi is a well-liked student who excels academically but grapples with inner emptiness and frustrations. His life takes a turn when he becomes captivated by a painting in his high school art club, sparking his interest in painting. Encouraged by his friend Ryuji, he joins the art club, becoming more deeply involved. Eventually, he set his sights on applying to the Tokyo University of the Arts for college.