A boy opens a chest at his father's temple, and out pops out a Hanyou, a half demon, half human girl who wishes for nothing more than to avenge the death of her mother and herself. It just so happens that the boy looks just like his ancestor, the one who killed the girl and her mother.

From Dangerous Pleasure:

Tomoya Kurata, having no living relatives, has just lost the elderly Kaname Tsukiyama to whom he was particularly close. One day, while grieving alone in the old-fashioned house where the memories of her remain, he encounters Hikaru Tatsui, who declares he is Kaname's grandson. "Would you mind living here with me?" he abruptly proposes, and Tomoya is forced into living in the same house. At first Tomoya is disgruntled, but is the feeling of being unable to turn his back on the somehow slightly lonely Hikaru gradually turning to love?

Protagonist Sakuragi Ryou was in the "A group" in middle school. At least until he got caught up some trouble and developed a reputation as a delinquent. Wanting to live a normal, peaceful life in high school he decides to do a reverse high school debut, aiming to be in the boring, middle-of-the-pack "B group". Above all else he doesn't want to stand out. But then one day he encounters the school idol, Fujimoto Erika, being harassed by delinquents and begrudgingly decides to help her out. She then starts to develop an interest in him, which is going to make his goal of not standing out tough...

Our protagonist, Ichimura Tamito, is a criminal magnet. Ever since he could remember he had attracted criminals from kidnappers kidnapping him when he was just a newborn, to robbers stealing his toys. He is determined to start a new life and make new friends after moving into a new city but at the start of the day he was bombarded by all sorts of crime. After encountering a knife wielding killer in broad daylight he saves a young girl that coincidentally belongs to the same class as he does. But something seems off about this girl and his new class too. It seems like our protagonist's magnetic pull on crime and criminals is getting stronger as he find out that he belongs to a class of criminals and suspects.

Love is the new kid on the block when he runs into the Peach Club, the local gang. Simple and gentle, with an interest in sex toys, Love isn't looking for trouble. Too bad the gang's got plans for him. And so does their leader, Peach.

The Japanese title is too long for the associated names so it is included here:
ボウソウガールズテキモウソウレンアイテキステキプロジェクト(B・G・M・R・S・P)

The story of a combined rivalry and friendship dating back to childhood between Beniko and Aoi. They only have one thing is common, and that is that they both love girls. Now they both attend an all-girls academy, and Aoi is more popular with the girls! Even worse, every girls Beniko has a crush on is interested in Aoi. The time for revenge in here!

As a six year old, Rintaro is diagnosed with Henisei Tashu Ijou Syndrome (also known as Hentai Syndrome), a disease that could kill him if he gets sexually aroused. To save him and provide a way for him to live as normal a life as possible, his father teaches him the ways to control his body and mind for ten years in the mountains, with the martial art of the Koei Sougetsu. When he's 16 he chooses to enroll Nangokuren High School, which he assumed to be the biggest all-boys school in the country but is actually the biggest all-girls school that has just gone coed.

On his first day he stumbles upon a large scale battle and learns that the first rule of the school is that it "Abides the Law of Nature" which has turned the campus into a war zone-like environment. Rintaro now sees transferring out as his mission, but will it be that easy now that he's caught the eye of the 3 "Dragons", the bodacious female leaders of the three biggest factions around?

Meet Handa Sei, a second-year in high school. Occupation: calligrapher. Admired by the whole school for his cool charisma, Handa is, in fact, naturally negative and sincerely believes that the whole school hates him!

A comedy about the misunderstandings of adolescence and mistaken impressions.

From JanimeS:

The world of Siesta is set in fantasy Europe where there are people called bullet users who were discriminated against badly for reasons unknown to readers as of volume 1.
The discrimination has gotten much weaker due to Grande Corp's efforts to wipe out the decades-old pirate faction with the help of Bulletron, a battle suit designed exclusively for bullet users.

The story begins as the protagonist Dia Canto tells you a little bit about herself: how she became an orphan, how she met her foster family, and how she is very much in love with her step brother, Loe. However, her affection toward Loe is brutally crushed before it would even bear fruit and she goes out to vent her sadness. This is when she encounters Cid Leon, who she would ultimately be paid to "protect".

This manga follows the story of 7 high school students, 3 boys and 4 girls in year 1 class A. Their not-so-ordinary ways of thinking and everyday lives are loaded with comedy, dirty jokes. At times, debating about how to use a toilet, at other times, risking their lives over growing body hair in unusual places!

Oota Katsuyo is a 15-year-old girl just entering high school. She's short and plump, thanks to being the daughter of a family that runs a tonkatsu shop. She's followed her crush from middle school to the same high school, and she's devastated when she finds out he's not interested in chubby girls. As she's looking for ways to lose weight, the free-spirited president of the swimming club, Itou Hatsume, and her serious and demanding vice-president, Kaji Rinko, are looking for new members to supplement their roster of two. When Katsuyo meets Kaitani Ayumi, a rail-thin girl with an appetite that matches her own, Ayumi drags her to the swimming club to join up. Will Katsuyo have problems measuring up to the demands of the swimming club, or can she make a big splash?

A demon sets out to create an all-girls harem of girls to impregnate and save her species from extinction.

Crossover between Ore Monogatari!! and Nisekoi.

The manga was released by Taku Kawamura @kawamurataku on Twitter.

By chance of fate, Godai met Mr. Yasuda, a rather pretty man, on his first delivery assignment up at Yamanoue Research Facility who greeted poor Godai with a beaming smile. Then the next day, was Mr. Aihara’s turn to receive parcels too. Only… he looks just like Mr. Yasuda. What the hell’s going on?! Never having anybody treat him so kindly before, Godai’s determined to get right down to the bottom of this!

A powerful grand wizard named, “Raim” reappears after a millennium because of a failed experiment. While sets out to regain his lost tower, he meets “are” and “ere” who have been trafficked as slaves... a combination of a weird grand magician who only uses his wits to make money and the cute, lovable brother and sister of the miao tribe! Their endless adventure is beginning to unfold. Editorial staff’s comment Will Raim be able to regain his lost tower?! 

Manhwa you may like:
+ This is another ambitious work of Sung San Young, The Gamer
+ Tower of God
+ The God of High School

Fushimi Inari has a hopeless crush on her classmate Tanbabashi. One day, while trying to interact with him, she accidentally humiliates him in front of the whole class. He refuses to accept her apologies, and, to make matters worse, she discovers that he probably has a crush on their incredibly cute classmate Sumizome.

She has all these things in mind when she is summoned by Uka-no-Mitama-no-kami, a pale fox goddess. In return for rescuing a little fox-spirit creature before school that day, the goddess offers to grant a single wish of Inari's. Without thinking, she blurts out that she wants to be Sumizome. As one might expect, this wish does not go nearly as well as Inari had hoped, and the kindly goddess breaks a goddess-rule to give Inari the ability to change herself back. Now, Inari can change her own shape at will, and using her new skill is very tempting as she keeps trying to win Tanbabashi's heart. But if Inari flaunts her ability, both she and the goddess might end up in trouble with Amaterasu!

From Lezhin:
The majority of men probably watched some sort of Japanese AV while growing up (some probably do even after they're adults!). This webcomic provides a real sneak peek into the AV industry with some added twists and drama!

With the genius-level reasoning ability he inherited from his grandfather Kousuke Kindaichi, Hajime Kindaichi has solved a great number of very difficult cases. But he is just a regular high-school student. Though he wants to get closer to his childhood friend Miyuki, he can't manage to make a move on her because no matter where they go, a terrible crime always occurs! Kindaichi hardens his resolve and invites her on a one-night mini-vacation! "This time it'll work for sure!" he says to himself. As goes without saying, this manga is a comedy spin-off of the popular work Kindaichi Case Files!

In the land of Glengard, the realm's 666th Demon King, Fienalia Glengard Flamveil...is bored. With no challenges to excite her and all of humanity long since subjugated, she's off to find a new worldany world!to conquer...and it just so happens that Earth is next on the hit list! But when "Ena-sama" meets Kento Sugitani, an aspiring manga artist, it seems she might have found a new hobby more interesting than world domination. What is a demon lord to do but enroll in a manga school herself?!

(Source: Yen Press)