Included in Otoko no Ko Comic Anthology: Zettai Fukujuu-hen.

In order to determine which hot spring is to be the top overall, all of the hot springs within the region enter an unofficial tournament. The tournament is simple battle of capturing the enemy's flag, but the battle itself goes beyond any human measure. It is customary for a female to enter these battles. Carrying their pride and their flag, their only objective is to defeat their opponent. Hence they are commonly called "Fighting Spring Princesses." Kikko, the Fighting Spring Princess of the Aizen Hot Spring Temple, is an eccentric, hot-blooded person who is going to have her debut battle. Sit back and enjoy the story of Kikko's path to becoming queen of all hotsprings!

The main protagonist is an Iga ninja named Saizou, who meets an Izumo priestess and protects her on her short journey to Sanada Yukimura. Sanada Yukimura is a powerful warlord in the Sengoku era. Sanada wants to gather 10 warriors, a party unrivaled in skill and power, to set his still secret plan into action.

Satomi Azusa is a popular teenage gravure idol. She's also a highly talented baseball player, but, as a girl, she can't play on her school's team. Her father happens to be the coach of the team, and he concocts a scheme to allow her to play. His scheme involves Hirayama Keita, Azusa's childhood friend, a teenager of no particular talent. Keita's redeeming feature is that he looks a lot like Azusa. In fact, after putting Keita in a wig and girl's clothes, not even their parents can tell the two of them apart. To help Azusa's (and her father's) dream come true, Keita agrees to trade places with her during the baseball games. Soon "Hirayama Keita" becomes a popular player, and "he" begins to move towards a career in pro baseball. How long can Keita and Azusa keep up the act? What will happen when people find out?

Volume 1 also contains My Sweet Sunday.

The year is 2028, location in New Koshigaya. A young boy, Isurugi Neru, lives in a poor family and is forced to quit school so that he can find his own way in life. Neru on the other hand, only thinks of one thing: to take revenge on Yagami, a classmate, who's especially gifted and has humiliated Neru numerous times.

Kazao is happy with his life on Mirai ("Future") Island. Sure, his parents abandoned him after he was born, leaving him to be raised at the orphanage-like facility, but his life is comfortable and has his friends, especially the lovely Eiko, the girl he loves. One night, however, he has a horrible nightmare where he sees himself die in a motorcycle accident. After that, everything changes. The next day, his parents are miraculously "found" and he is torn from his idyllic life and Eiko's side to be thrust into a world he knows only from television shows and school assignments. Dropped unceremoniously in the middle of a city with only a sketchy map for guidance, Kazao is saved from wandering aimlessly in search of his new home by the cute and forward Yuu, who turns out to be in his class at his new school as well. Despite his best efforts to accept his parents' sudden return and Yuu's friendly overtures, Kazao can't shake the feeling that things aren't quite right. Nor can he forget Eiko. Why did his parents wait sixteen years to call him back? And why is the piano the only used piece of furniture in his parents' new house? The mysteries begin to pile one atop the other as the lies fall apart in this intriguing story of future possibilities and innocent romance.

Two girls start their freshmen year of high school. However, the two girls after years of being together are separated. One of the two does not take this easily and her world falls apart.

Onodera Goushi is a high-schooler who isn't much noticed in other people's daily life. In a sense, his life feels like it would be the same if he wasn't around. Then one day while returning from school, he finds himself in a life and death situation where a strange girl named Honoka saves him by sending him to another world. He then gets sent to the "Demon Nation" where many non-humans live and where he is able to meet the Ma-Ou (Demon King) who is... an anime otaku?!?!

Aflame Inferno is about a self absorbed high schooler, Kang Shichan, that gets caught in the middle of a battle between demons. Injured severely and near death, the demon Inferno merges with the student to save his life. Together they win the battle to discover that they are inescapably joined. The only hope of ever being separate beings is to gather 1,000 Invento Hells and find the right spell of Resurrection. Can Kang Shichan balance hunting down demons with his school work?

Closet otaku and school idol 16 year old Aiba Hina announces right at the start that she is going to quit being an otaku, but apparently she was going to stop being otaku because a manga character said he hates otaku. Fujoshi power max!

She tries to sell all her most precious otaku collections at I-books at Radio Kaikan 3F, but ends up getting seen by a classmate who was working there part-time at the register.
In order to hide her identity as an otaku she decides that the only way to salvage the situation is to assassinate the classmate who saw her in the store!?

A collection of short stories including

• Allumage
Kumiko left Japan for LA in hopes of becoming a famous actress, but so far has only managed to get jobs as a stuntwoman. Now that her brother is getting married, she's coming back to Japan to visit, but once she arrives, something goes terribly wrong...

From Yen Press:

As punishment for slacking on the job, the shinigami Lapan is ordered to go to the Human Realm in the body of a skeleton to retrieve a wandering soul. However, much to Lapan’s lecherous delight, a slip-up lands his soul in the body of the young Alice, a buxom student at a local all-girls’ school. With the skirt-chasing shinigami (as Alice) leaving a storm of sexual harassment allegations in his wake, whatever is poor, beskeletoned Alice to do?!

Codenamed Alice, she's an expert assassin...

...well, a trainee assassin. But she's still highly-skilled with various forms of firearms, and she gets the job done...

A collection of stories focusing on all the heroines within the Amagami series.

Based on the visual novel by Enterbrain with the same name.

Note: This manga focuses on all of the girls at once, instead of different arcs.

Tomoki, a high school student lived with his older sister. What happens when a normal boy has to put up with his sadistic but popular sister?

The one thing not ordinary about high school student Ryouta is that he has an aspiring manga artist for an older sister. She is so dedicated to her drawing that, despite being 21, she's never really been in a romantic situation. Unfortunately, when she gets her first real job, it's to write an erotic manga. Desperately, she enlists the reluctant Ryouta's help, as a 'model', to figure out how exactly to draw this sort of manga.

The girl, Mana, has no problem with seeing the scenes she plays with her brother as nothing but a hollow reference for her works.... But she fails to realize that her brother seems to become more and more flustered with each 'live performance'.

There is a competition for those who possess the spirit weapons. Only someone with one of these weapons can defeat another.

Enter our protagonist, a clumsy flower girl who one day embarrasses a weapon master...

What is our flower girl going to do? What is the purpose of this competition?

Okinawa. An ordinary senior high school student, Kio, meets an alien girl who has cat ears and a tail who came to Earth so that she could learn more about it. In the end, he decides to bring her home. However, living with such a person might not be as easy as it seems for Kio!