Original webtoon (Korean webcomic)

Inubuse Kuromu aspired to be King in Chess, he was so skilled he represented Japan in the World Youth Chess Championship at age 11. However, due to his loss to a mysterious, wolf-like player, he developed a condition where he can't sit in front of anyone?! Because of this condition, he stopped playing Chess and chose to solely focus on his studies until his fingers break. Three years since his loss, while desperately still holding onto his title as 'King' through internet Chess, he meets an incredibly strong opponent. This game…starts his tale to become King.

Li Xao Yao left S.W.A.T to become an ordinary security guard, while working, he happened to enter the VIP room and found Lin Wan Er still in the middle of changing, as revenge, she took him on a ride and kicked him out of the car. After hours of walking, Li Xao Yao finally managed to get back home just to be kicked out of the house. He then got an offer from his previous supervisor to become the bodyguard of the Tian Xi group ceo's daughter both in game and in reality. But unknown to Li Xao Yao the girl was actually...

Madam Misa dies mysteriously at the Saturday Night Club. Soon after her death, her young handsome and broke host Hideo opens a similar looking "Host" Club of his own. Where did the money come from? Did Hideo have something to do with Madam Misa's death?

From Kodansha:

After a battle with an evil demon, an entire village is laid waste. All perish, except for one boy. Keeping his master's teachings close to his heart, this lone survivor sets out on a journey westwards in search of new sights and unimaginable power. The boy's name: Gray Fullbuster. For the first time, experience Gray's childhood adventures, and follow him down the path that will lead him to Fairy Tail!

Mamoru is a Nishiarai game player who has switched to a first-class powerful new high school named Hijiri Gakuen Koukou. There he met with a group of eccentric game lovers who call themselves Dennou Kenkyubu, he accidentally joined and had to undergo a variety of events and adventures with them.

Story of Hatta Shuuji's encounter with problem-child and popular model Haru. Incidentally Shuuji is the childhood friend and ex-housekeeper of Maruyama Mie.

Her whole life, Hikari Hanazono has been consumed with the desire to win against her school rival, Kei Takishima--at anything. He always comes out on top no matter what he does, and Hikari is determined to do whatever it takes to beat this guy!

At age 6 Hikari lost to Kei in an impromptu wrestling match. Now, at 15, Hikari joins "Special A," a group of the top seven students at a private academy, for the opportunity to trounce the guy who made her suffer her first defeat. However, Kei's feelings towards Hikari are different.

Included are the following unrelated short stories:
V.1 - Mikansei Chorus
V. 11 - Shoku no Miyako

A young man, Kaneda, is inflicted with trauma-induced amnesia after discovering the body of his classmate and friend, Hiwako Shima. After being picked up from the hospital by a mysterious benefactor, he resumes school, and tries to piece together his memories of the incident. To make matters more confusing, his buried memories have manifested in the form of a surreal being, whose head is shaped like a crescent moon. Together, they set off to solve the mystery of Hiwako's murder.

Details the meeting of the founders of Fairy Tail and exactly what happened between them to lead them to found the guild. Told primarily from Mavis' perspective.

This is the story of several people that possess ESP powers, known as (PSI)

Rika is known to be a cheerful girl, but is that her real self?

From Winter Translations:

This is a story about a pair of twins who're, undeniably very different from one another. Big brother Shuuya and little brother Yuuta are basically light and shadow...

From Loveless' Site:

Amidst the crowds in Asakusa district, Tokyo, a young man is assaulted by a group of bandits. When a red-haired stranger comes to his rescue, Suoh falls in love at first sight, but all's fair in love and war.

Touge Yuugiri is a chick magnet. Without lifting a finger, girls vie for his attention, "accidentally" topple on him, or even invite him to spend some special time alone—it's almost as if he is the protagonist of a harem manga! But Touge could not care less about the attention, as he is gay and feels nothing towards the opposite gender's affection. Yet all his attempts to escape, reject, or scare them away have the complete opposite effect, only intensifying the girls' admiration—as if some cosmic interference was at work. Bombarded by nonsensically perverted situations and unwanted sentiments, Touge's life spirals into a living hell, truly reflecting how one man's dream can be another's nightmare.

*The series alternates between different sets of pairs. Although it's supposed to be read as a whole, you can skip volumes with the pair(s) you don't like. Warui _____ Featuring the school delinquent Towa Aikawa and the student council president Mikado Shirahane. (Pair 1) V. involving this pairing are: V.01, V.02, V.04, V.07, V.11 _____ ja Nai Kedo Featuring Shuuji Yukimura, the formidable student council vice-president, and the problematic childhood friend, Ryuuichi Shinonome (Towa's friend). (Pair 2) V. involving this pairing are: V.03, V.05, V.08, V.10, V.? (The love troubles continue for Yukimura Shuuji and Shinonome Ryuuichi as obstacles arise between them under the guise of Kousaka Nao, Shinonome's friend. Can they finally reach an understanding and solve their miscommunication?) Mujihi na _____ Featuring Nanao Shirahane (Mikado's older brother), a male siren, and Kuon Aikawa (Towa's older brother), a fellow student attending the same university. (Pair 3) V. involving this pairing are: V.06, V.09, V.12 Shouwaru Ookami ga Koi o Shita Rashii (Wicked Wolf Seems to Be in Love) Featuring former student council president, Shirou Akagi (Mikado's rival in Warui Koibito and Warui Oujii) and disciplinary committee member, Nao Kousaka (Yukimura's rival in Sunao ja Nai Kedo). How will those two damaged people find their respective love? (Pair 4) V. involving this pairing are: V.13

Tsuji Motochika is a guy who loves little girls. Yuna looks like a little girl, but she's actually older than Tsuji. Also, she likes much older men.

Together, they make an agreement to show each other's greatest desires - Tsuji's father and Yuna's little sister - and in the process, learn that age is only a number.

Someone is trying to kill Maejima, the unassuming Archery club adviser and Math teacher at Seika Women's High School. What appears to be pure, dumb luck has gotten him through several attempts unscathed, but he has no clue as to the perpetrator and the Principal would rather not involve the police in what's "surely just a student acting out". With the entire faculty and student body as his suspects, Maejima struggles to discover the culprit before his luck runs out.

Maya is a mysterious young girl who is hired as an assistant to detective Matsunomiya. The Imperial City of the Taisho Era has a mixture of Eastern and Western cultures... What kind of adventure will the two encounter here?

Spin off of Hitsugi no Chaika. Takes place in high school.