Seinen

Genre: Comedy, Romance, School, Harem, Seinen
Type: TV Series
Age Rating:   Everyone  

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Synonyms: NakaImo, One of Them is My Younger Sister!, Who is

Kono Naka ni Hitori, Imouto ga Iru! Episodes Online

Abiding by his father's will, Shougo was transferred into an academy where many young girls attend. It appears as though his younger sister (separated from him at birth) also attends this academy, and that she is trying to get closer to him without letting him know who she actually is. Problem is, Shougo seems to be popular with the other girls as well! Can Shougo "properly" reunite with his little sister and while making a girlfriend at the same time?!

(Source: MU)

Genre: Fantasy, Seinen
Type: TV Series
Age Rating:   Everyone  

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Synonyms: Humanity has Declined

Jinrui wa Suitai Shimashita Episodes Online

It's been several centuries since human beings declined due to the steep drop in birthrates. The most prosperous species on the Earth are "Fairies", 10 cm tall creatures with high intelligence. I became a UN arbitrator between the humans and the fairies and returned to my hometown to help my grandfather. I thought my job would not be a tough one and visited one of the fairies' habitats to say hello to them but...

Genre: Comedy, Romance, School, Slice of Life, Seinen
Type: TV Series
Age Rating:   Everyone  

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Chitose Get You!! Episodes Online

Chitose is an 11-year-old girl who is madly in love with an older guy named Hiroshi. He works at the town hall right next to the school and Chitose spends every day relentlessly pursuing him. Can Chitose ever convince Hiroshi to go out with her?

Genre: Action, Historical, Military, Seinen
Manga: Read Kingdom Manga Online
Type: TV Series
Age Rating:   Everyone  

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Kingdom Episodes Online

In the Warring States Period of ancient China (475-221 BCE), Shin and Hyou are war-orphans in the kingdom of Qin. They dream of one day proving themselves on the battlefield. One day, however, Hyou is taken to the palace by a minister. Winding up on the losing side of a power-struggle, Hyou manages to return to the village, barely alive. Shin then meets a boy who closely resembles Hyou, Ei Sei. For now he is the king of Qin; later he will become the emperor Shi Huangdi.

(Source: ANN)

Genre: Action, Adventure, Demons, Fantasy, Supernatural, Military, Seinen
Episodes: 1
Type: Movie Series
Age Rating:   Everyone  

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Synonyms: Berserk Movie, Berserk Saga, Berserk Golden Age Arc I: Egg of the Supreme Ruler

Berserk - Golden Age Chapter I - Egg of the High King Episodes Online

Guts, an immensely strong sword-for-hire, has little direction in his life, simply fighting one battle after the next. However, this all changes suddenly when he meets and is bested by Griffith, a beautiful and charismatic young man who leads the Band of the Hawk mercenary army. After Guts joins the Band and the relationship between the two men begins to blossom, Casca, the tough, lone swordswoman in the Band of the Hawk, struggles to accept Guts and the influence he has on the world around her. While the two men begin to fight together, Griffith continues to rise to power, all seemingly in order to reach his mysterious, prophesied goals. What lengths will Guts and Griffith go to in order to reach these goals, and where will fate take the two men?

(Source: ANN)

Genre: Action, Adventure, Seinen
Type: TV Series
Age Rating:   Everyone  

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Jormungand Episodes Online

The series follows Koko Hekmatyar, a young arms dealer who sells weapons under HCLI, a weapons corporation.

As one of the company's unofficial weapon sellers, she secretly sells weapons in many countries while avoiding the local authorities and law enforcements as most of her work is actually illegal under international law. Traveling with her is her team of bodyguards who are mostly composed of ex-military veterans.

Her latest addition to her crew is Jonah, a seemingly emotionless child soldier who is skilled in combat yet ironically hates arms dealers. Jonah joins Koko as he wishes to find the arms dealer responsible for his family's death.

What follows is Koko and her crews escapades around the world.

(Source: Wikipedia)

Genre: Mystery, Ecchi, Romance, School, Seinen
Type: TV Series
Age Rating:   Everyone  

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English: Mysterious Girlfriend X

Nazo no Kanojo X Episodes Online

One day, a strange transfer student appears before Tsubaki. Urabe Mikoto is an antisocial girl, whose hobby is just sleeping during class-breaks. One day, Tsubaki goes to wake her up and accidentally tastes her drool... And gets hooked on that!

After that, he starts going out with her and gets to know her better. Her second hobby, as it turns out, is carrying around scissors in her panties and cutting paper into flowers...

(Source: MU)

Genre: Action, Comedy, Seinen
Manga: Read Upotte!! Manga Online
Type: TV Series
Age Rating:   Everyone  

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Upotte!! Episodes Online

A teacher is looking for a school by the name of Seishou Academy, as he is a new transfer teacher for that school. Seishou Academy is known for having students with excellent marksmanship. However, he gets lost along the way and decides to look for someone who knows where the school is at a summer festival.

He encounters a girl at a shooting range and finds her marksmanship skills to be professional. The girl tells the new teacher that she is an assault rifle, not a student. Her name is FNC and is an assault rifle of Seishou Academy.

The new teacher attends school the next day to find students, including FNC, practicing shooting M16s and realizes that he has come to an unbelievable school. How will his experience be at Seishou Academy?

(Source: MU)

Genre: Comedy, Slice of Life, Seinen
Type: TV Series
Age Rating:   Everyone  

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Synonyms: Yurumeitsu 3D

Yurumates 3D Episodes Online

Yurume, an 18-year-old "ronin" and recent high school graduate, has high hopes of being accepted and attending Tokyo University. She moves into an apartment complex, the Maison du Wish, located on the outskirts of Tokyo where other ronins living there are studying for upcoming college acceptance exams.

Genre: Romance, School, Seinen
Manga: Read Acchi Kocchi Manga Online
Type: TV Series
Age Rating:   Everyone  

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Synonyms: Place to Place

Acchi Kocchi Episodes Online

Wouldn't you just love to poke in a relationship between two young high schoolers who have a subtle distance between each other? Of course you would. Tsumiki and Io have this subtle distance that anyone would want to jump in between just to bug them. That's what the other characters are there for. Tsumiki, being a tsundere and all, won't be honest about her feelings toward Io. Io on the other hand is unaware of Tsumiki's feelings, hence the subtle distance between the two. Now, let's watch these two and see what events await them...

(Sources: Mamo, Mangahelpers)