From Forever More:

Tired after working all day long, the divorced (with kids?!) salary man, Saeki Ryouji was taken in by the incredibly rich high school student, Mibu Ryuunosuke, after having collapsed in the middle of the street. When he awoke, he was kissed by Mibu who said, “I like you,” at which point he realized he had been brought to a glamorous and luxurious mansion…!!! Even despite this astoundingly shocking development, the guilt he felt the second he rejected Mibu, who was on the verge of tears, brought Ryouji to…? Differences in age, differences in social standing, they are nothing but a bother. Are there simply too many obstacles to the love that has blossomed between a sheltered young Master and a pure and cultured oyaji? At the same time, the sense of duty an obstinate butler feels towards a forceful senior high school student, who is in a position of superiority, brings to mind the question, “Do you like butlers?”

From Chibi Manga:

Yoshino wanted to give valentine chocolate to her boyfriend, but a robot which was created by her inventor father, tried to get in her way!?

Despite the content of their relationship, the delinquent Towa Aikawa is still a "friend" of the Student Council President, Mikado Shirahane. But today, Towa gets to sleep-in at Mikado's house for the very first time! Could their relationship advance into "lovers" now...!? List of Warui Series: Vol 1 Warui Koto Shitai [1-1] Vol 2 Waruiko Demo Ii? [1-2] Vol 3 Kirai ja nai Kedo [2-1] Vol 4 Koi Ja nai Kedo [2-2] --- Warui Koto Bakkashite Gomennasai [1-3 &/ 2-3] Vol 5 Warui Yatsu Demo Ii [1-4] Vol 6 Mujihi na Otoko [3-1] Vol 7 Warui Koibito ja Dame? [1-5] Vol 8 Kare ja nai kedo [2-4] Vol 9 Mujihi na Anata [3-2] Vol 10 Sunao ja nai Kedo [2-5]

From Shoujo Crusade: Akari always goes to a particular coffee shop, but not for their coffee. It's to see Naruse Hijiri-kun, a waiter who's totally Akari's type. And then suddenly one day she finds him waiting outside her school? Also includes: • Haru Koi Kaede has been trying to befriend her desk neighbour Muromachi Isami, but when she greeted him, he yelled at her?! In fact every time she greets him, he glares at her. Not giving up, Kaede tries to see the good (cute) side in him... • Power of Love Mikoto has always felt lonely ever since her parents divorced, but she starts living in a new family with a dad and a son in her age, Shou. As much as tries to have a happy family in her new home, Shou seems to be reluctant, but our happy-go-lucky Mikoto will not give up! • Flying Start! • Haru ni Kaze to Yuki ga Furu!

After ups and downs and lots of deep things went between, now the delinquent Towa Aikawa is a very "deeply involved friend" of the Student Council President, Mikado Shirahane. But when Towa visits Mikado's house for the very first time, Mikado's elder brother thought he was Mikado's sex-friend... List of Warui Series: Vol 1 Warui Koto Shitai [1-1] Vol 2 Warui ko Demo Ii? [1-2] Vol 3 Kirai ja nai Kedo [2-1] Vol 4 Koi Ja nai Kedo [2-2] --- Warui Koto Bakkashite Gomennasai [1-3 &/ 2-3] Vol 5 Warui Yatsu Demo Ii [1-4] Vol 6 Mujihi na Otoko [3-1] Vol 7 Warui Koibito ja Dame? [1-5] Vol 8 Kare ja nai kedo [2-4] Vol 9 Mujihi na Anata [3-2] Vol 10 Sunao ja nai Kedo [2-5]

From here:

The basic story: a high-school student (Nanase Hokuto) living away from his parents (who are in Australia) shares an apartment house with three older girls. His exposure to their whimsical and teasing nature leaves him pretty much despising females. However, the high-school idol (Taniyama Maina) ends up having a crush on him. Her best friend is Nakajima Atsumi, your typical sukeban. Hokuto's best friend, Moriyama Syuuichirou, is the young-punk biker. These two friends conspire to hook Hokuto up with Maina, much to Maina's delight and Hokuto's chagrin. Into this setting we interject the jealousy of the rest of the high school, a female rival for Hokuto's attention, a number of fights, the inevitable parents recalling Hokuto, and Maina threatening to run away from home. We could go on, but pretty much everything is in here.

Sequel of Kirai ja nai Kedo and Koi ja nai Kedo making it the third story of the Yuki-Shinonome series. As we left off from Koi ja nai Kedo Yuki has finally agreed to date Shinonome. But it seems he is having trouble thinking of Shinonome as his boyfriend. Will Shinonome once again be able to win over his lover's stubbornness and become real boyfriends with him? List of Warui Series: Vol 1 Warui Koto Shitai [1-1] Vol 2 Waruiko Demo Ii? [1-2] Vol 3 Kirai ja nai Kedo [2-1] Vol 4 Koi Ja nai Kedo [2-2] --- Warui Koto Bakkashite Gomennasai [1-3 & 2-3] Vol 5 Warui Yatsu Demo Ii [1-4] Vol 6 Mujihi na Otoko [3-1] Vol 7 Warui Koibito ja Dame? [1-5] Vol 8 Kare ja nai kedo [2-4] --- Warui ko Tachi no Bansan [1-6 & 2-5] Vol 9 Mujihi na Anata [3-2] Vol 10 Sunao ja nai Kedo [2-6] Vol 11 Mujihi na Karada [3-3] Vol 12 Warui Ouji Demo Suki [1-7]

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1-4) About The Neighbor + Extra
That day, Miyata, who is still preparing for his university exam, got home and found not his brother, but an unknown man. That man, Shirai, has just moved into the neighbourhood. He looks at Miyata's messy test sheets and offers, "Shall I teach you?" With his airy smile and nearly perfect self, Shirai forcefully becomes Miyata's private tutor... and Miyata slowly becomes interested in Shirai... From Shinmakoku Scanlations

5) Unknown Words
Imaoka is a frivolous playboy, who might not be as frivolous as they say. Miki is a quiet boy who catches Imaoka's eyes and heart.

6) Unknown Name
Follow up about Imaoka and Miki

7) The Freezing Palm
Ishida has a dark secret about something he did in high school.. but 2 years later, he runs into his old teacher Mizushima-sensei - the person he wronged. Instead of being angry, Mizushima invites Ishida into his home... ?

8) Blindfolding Your Eyes Gently
What should I call you from now on? Continuation of Ishida and Mizushima, whom he now calls Motoi-san.

8.5) Sweet Fingertips
The Freezing Palm extra.

From Cinderella Story:

Matsuri Takanose a first year high school student. Her mother is the board chairman of the school, and Matsuri is under a lot of pressure to be the perfect student. One day after a grueling meeting in her mother's office at school, Matsuri encounters two boys who treat her differently. One is Takemasa Andou-kun, a smart, quiet guy who is known for keeping to himself and not talking much. The other is Watanuki-kun. Kaguya Watanuki is a very cute, outgoing, athletic guy. He and Andou-kun are classmates, but they don't appear to be friends. Later Matsuri happens to find out about her favorite idol pop singer and those two's relationship... This sets up an interesting love triangle...

Mia is a princess of the country where people are either masochistic (M) or sadistic (S), but generally only royalty is (S). Her daily duties consist of insulting, stepping on and generally bullying her people, and they're all happy about it! But the day comes when Mia has to transfer to a foreign country for a year to study there. The only problem is.... people there are normal. When Mia changes schools the (S) and (M) hilarity begins!

From Bakeneko Scanlations:

The barbequed meat shop owner, Yotsuya-san continues to harrass the part time worker Matsuda-kun saying “Your smell is special”. At first Matsuda-kun is baffled by this, but gradually he develops a liking towards Yotsuda-san…!?

Also includes a spin off of “17 Sai no Hisoka na Yokujou”- “Anata ga hoshii"

A box that grants three wishes might seem like a dream come true.
At least that's what Keita thought, but inside the box he finds a girl. And this girl is no genie--Maki's a devil princess, and she's come to take Keita's soul! But she can only take his soul after he makes his third wish.
So, as a sheltered demon with little knowledge of how to be evil, Maki must rely on her trusty guidebook to teach herself the ways of the nefarious arts and trick Keita into using up his wishes. Until then, Maki's going to live with Keita until he can't stand living anymore.

The story set in the contemporary South Korea. Some 30 years ago, unidentified creatures appeared out of nowhere and have attacked people. They have caused massive destruction wherever they go. The monsters are called "Trouble"s, and get the world have fallen into chaos. Along with the first appearance of the "Trouble"s, some number of humans were born with or acquired supernatural abilities. These mutants called "Trace"s are the only ones who can fight the "Trouble"s. The "Trace" are also considered freaks and generally shunned by the community because some of them misused the powers for their own interest. The plot revolves around two main characters. Sa Ghang-Gwon, a high school student born as a "Trace" who attempts to hide his ability. The other is Kim Yun-Sung, who acquired his "Trace" abilities during his early 30's. Webtoon from Daum

From StarryHeaven:
Hisui used to live on Kohaku Island, where she lived by the ocean and loved life. However, she’s changing schools and thus has to leave her best friend, Kairi the dolphin, behind… It’s at that time, Hisui meets the swim team’s hot Minato by chance…! Could this be a blooming love for the attractive boy, or a replacement for her dolphin Kairi?

Yurie Hitotsubashi was just an average middle school student living in the city of Onomichi on Japan's inland sea. She spent her days worrying about exams and trying to get Kenji, the clueless boy she likes, to notice her. Then during lunch one day she suddenly announces to her friend Mitsue that she had become a goddess the night before. Their classmate Matsuri quickly latches on to Yurie's newfound divinity as a way to promote her family's financially struggling Shinto shrine. She hopes that in replacing Yashima-sama, their ineffective local god, with Yurie, it will make the shrine more popular. Now all Yurie has to do is figure out what she's supposed to do with her power.

From Shoujo Manga Maniac:
Tsubaki Beniko, 16 years old. After being rescued by the handsome prince of the school Kendo Club, Shirotae Shiki-kun, she fell in love with him! But even after becoming a couple, Beniko sees him always distant, and she wants him to be more like a boyfriend should be! But once Beniko's childhood friend, Kurosu Yui-kun, comes back, maybe that'll be the time for Shiki to show his real feelings for her!

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A crossover between the couples in Honto Yajuu & Sukitte Iwasete whereby they swapped their roles as in Tomoharu & Aki becomes university students, Eiji, Shun & Hidekazu becomes policemen while Shou becomes a yakuza.

From MangaHelpers:
Ever since reading an article on a festival for the male genitalia, Mochizuki Yumeko can NOT stop thinking about the penis. It's not that she wants to have sex. She is just feeling this uncontrollable fascination with the penis. The only problem is that she has never seen a real penis. To satiate her obsession of witnessing a real penis, she looks into nude modeling. Now, she succeeded into convincing the timid, and only, member of her school's art club into nude modeling for her. Her journey into avant-garde male genitalia art beings.