From Midnight Scans:

Eri is a normal high school student, who feels satisfied with her life, if there are Red Tea and sweets around. However, fate plays a trick on her, and she is assigned to learn the art of making tea from Secret Garden’s #1 butler, Ijuuin!! Mr. Butler’s lesson is exciting and strict, and, sometimes… pleasantly perverted?!

In the Shitsujisama to Himegoto series:
1) Shitsujisama to Himegoto
2) Black Label

One night, a man finds a homeless person on the street and takes the person in as his pet. On the next day, the guy finds out that his pet is also his new co-worker.

Himoto Sora is a transfer student with a sense of justice and dreams of becoming a knight. Upon arriving at Utopia Gakuen, she learns of a virtual reality-like game played by the male students in which they use girls as weapons in battles for status and treat them as commodities. Seeing one of these girls being abused she steps in and through some sort of error unwittingly becomes the first female participant of the game.

Republished in 2017 in a 3 volume omnibus
1) Shitsurakuen - Hangyaku no Otome no Shou
2) Shitsurakuen - Shinai no Otome no Shou
3) Shitsurakuen - Rakuen no Otome no Shou

From Midnight Scans:

A collection of 5 oneshots:

1) Shitsuren Biyoushitsu
She breaks the school's hair code because she wants to be noticed by the teacher. But, her teacher is transferring...

2) Itsuka Suki to Ieru Made
Tamao grows her hair in order to look like a decent girl, but...?!

3) Kono Koi wo Mousukoshi Dake
Nana and Nene are twin sisters. Nene's always copying Nana, and...?!

4) Kimi Iro Destiny
Having red hair was my complex. You told me that it was the red string of fate...

5) Shitsuren Mobius
Kirie goes to the Shitsuren Biyoushitsu. That is because of her hopeless love towards her sibling...

From Aerandria Scans:
Souta, who's attending a confectionary school, is in a relationship with Saeko, a girl one year older than him. He fell in love at first sight with her four years ago, and right before Christmas last year, they finally had their first kiss. Because his girlfriend really loves chocolate, every day, Souta tries to polish his chocolate-making skills. Even when his girlfriend smells like cigarettes although she doesn't smoke, even when she turns down his invitation to a date on Valentine's day, he's still not broken-hearted at all, and he still continues to love her.

Note: Won the 2012 Kodansha Manga Awards in the Shoujo category and was nominated for the 4th Manga Taisho Awards in 2011.

A collection of one-shots. The first story is about Ichi-san and his persistent junior from his part-time job, who offers him the love that he might not yet be ready to accept. What made Ichi-san put on the mask of a bastard and what made him this scared of being cared for by another?

An ongoing series revolving around Atsuya, who is an "Unrequited Love Maniac" and the loves of his life.

Prequel: Hatsukoi Moratorium inside Shotgun Marriage
Vol.1: Shitsuren Mania (Unrequited Love Maniac)
Vol.2: Junai Allergy (Allergy to Pure Love)
Vol.3: Netsuai Complex (Ardent Love Complex)
Vol.4: Dekiai Egoism (Enraptured Love)
Vol.5: Katsuai Catharsis (Catharsis of the Love)
Vol.6: Saiai Ambivalent (The Dearest is Ambivalent)
Vol.7: Mitsugetsu Melancholy (Honeymoon Melancholy)
Vol.8: Tooi Dearest (Long Distant Love Just Now)
Vol.9: Kyuuai Syndrome (Courtship Syndrome)

From Chibi Manga:

In that world, there are popular people and not popular people. That’s what that Miya-kun told Rui (17 year), who is not popular, after he dumped her. But what kind of girl will replace her…?!

Aika Asakura was about to jump the cliff, but she instead saved a cat. There she encounters Hotoka Houshido, a veterinarian that saved the cat's life. However, saving this little critter had unfortunately left her in debt, so he had arranged for her to work and live with him...

Hina strives to have the perfect girl image, but in reality, she's just a average delusioner. When she was having yet, another daydream, a boy ask her out and she, in a daze said yes? Little did she know she said yes to the school's most popular boy- Taiga, and on top of that, he found out her true nature! What will our Hina do?

From Shinmakoku Scanlations : Instead of saying what he wants to say or do what he wants to do, Sawahata smiles to avoid getting involved. His school life seems so boring and nothing interests him anymore. Until he finds Hoshizaki glaring at him from across the classroom. The no-eyebrows-face intriques him, pulling at emotions he doesn't know he has. What does Hoshizaki really want from him? And what should he do now that he can no longer avoid Hoshizaki?

High-school girl Kamigaya Kai often gets confessions. She then poses a requirement "If you let me stab you to death, I'll give my love to you.". This way people don't reaproach her in her quest to live her boring life, with boring parents, boring school colleagues and boring media.
Kuwashima Kusabi, a seemingly plain girl brightens the world that is "boring" to Kamigaya Kai. It first seemed like she was the 5th confession that turned someone off, but she ran home instead to fetch a sturdier knife.

Based on the BuzzG's famous Vocaloid song Shiwa, Chiharu isn't a girl who sees the point in things like romance. To her boys are just an annoyance, but what will she do when she starts to develop feelings for a boy at her school?

Shi, Hwa and Mong are sisters. They have something special: they are triplets. After losing their mother, they are each entrusted to a different family. Thus, Shi lives in New York; Mong in Japan and Hwa remains in Korea. Nine years later Shi comes to find all the three in Korea... What became of their father? And why were they separated?

From The Faiien Scans: Protagonist XiaoFei used to be an ordinary guy from H city. After the spring water was contaminated with a virus, however, he unexpectedly encountered an unprecedented crisis. The people living in H City became zombies one by one, devouring each other, and gradually evolving. Can XiaoFei escape from H city and meet up with his girlfriend Wei? The story now begins...

When people die, they end up in the Ministry of Death, where they must fill out the necessary forms (the paperwork doesn't end at death!) to be able to ascend to heaven. Depending on the lives these people lived though, their application may not be approved by the employees of the Ministry of Death, and they may be sentenced to hell instead! Follow the daily lives of the employees as they judge and assist the dead in the afterlife.

1000 years ago in the Heian Period, the human Princess Shizu and the oni Shuri (also known as Benkei) fell in love and married. When the princess died young, the oni turned to stone in his grief.

1000 years later in the modern day we meet high school girl Shizuko. On her 16th birthday, when she is old enough to marry, she is accosted by Shuri who has awakened from the stone and now claims to be her husband. It turns out that Shizuko is the reincarnation of Princess Shizu. Shizuko is overwhelmed and weirded out by all this. Shuri, meanwhile, declares his everlasting love for Shizuko and resolves to do everything in his power to make her love him again like she did in her past life.

From Liquid Passion:

When business leads Haruna to Nakagawa's family-owned brewery, it's love at first sight for Haruna. Too bad that Nakagawa and his crotchety grandpa can only say "not interested" to his offers. Will Haruna ever secure the distribution rights to the best sake in town? And more importantly, will he manage to win over the cantankerous brewer's grandson?

Oneshot by the author of Murcielago about a high-school arms dealer and a sale that goes horribly wrong. Comedy, absurdity and violence ensue.

A devoted follower of the goddess of celebration, Analis, created Steffens, a school solely dedicated to food and cooking. The new transfer student Chlorophyll Rewrite has caused quite a stir by taking the number one spot in the school. He is a germaphobe and is scared of being touched or even eating food cooked by other people. Chlorophyll, or Chloro, was admitted into the academy on one condition: he must be the top student in all the classes he takes or he will be kicked out. The former number one student, Antosiannie Eda, is a long time childhood friend of Chloro and also the reason he became a germaphobe. Chloro came to Steffens to make a name for himself and to overcome his phobia but it’s never as easy as it seems.