From Sura's Place:

Boring days, boring life. She wants her life to spice up with a mystery or two.
She gets her wish.

And epic sci-fi story heavily influenced by the Epic of Gilgamesh, as several groups fight for a mysterious power. While a close brother and sister get tied up into the battle unwillingly.

Mihama Academy - on the surface, a closed learning environment established to nurture students who find themselves at odds with the world around them; in actuality, an orchard-cum-prison built to preserve fruit that has fallen too far from its tree.

Whatever the circumstances behind its establishment, Mihama Academy is at present home to five female students, all with their own reasons for "enrollment." For better or worse, each girl has established a routine obliging of her current situation; life moves at an idle, yet accommodating pace within the walls of Mihama.

Yet with the arrival of the institute's first male student, the nearly preposterously opaque Kazami Yuuji, the students at Mihama begin to fall out of step with their predetermined rhythms. Will Yuuji prove to be the element the girls around him needed to take hold of their lives once more, or will the weight of their pasts prove too steep a wall to overcome?

A young girl answers the door late at night and looks up to see a very, very tall man standing before her.

Chapters 1-2: Cocytus- A girl who cares very much about fitting in, and the girl she falls in love with, who wants to be honest about everything -- including their relationship. How will this work out...?

Chapters 3-5: Moratorium
Itsuki and Mao are aware of each other's feelings. However, both of them are waiting for the other to confess.

In the Pretty Babies series:

Part 1 - Pretty Babies (1 Volume - Complete)
Rookie detective Chikara has been assigned to the close minded, hard-faced senior detective Ibuki, One day, Chikara, who had tailed Ibuki in order to uncover his secrets, witnesses Ibuki carrying a suspicious heavy bundle out from a church. Then, after almost being run down by a car, Chikara is asked to spend the night with the beauty who'd been driving in lieu of compensation...?!

Part 2 - Heavy x Beauty (3 Volumes - Ongoing)
In the middle of the night, Ibuki suddenly calls on his superior Kiriya. Both work at the Metropolitan Police Department and have been dating each other for the last three years. One day, Kiriya's uncle proposes to headhunt Ibuki, and talks of Kiriya's own arranged marriage introduction.

"Hmm, I guess it's high time." Kiriya sighs upon receiving a phone call from former bad company...

After her mother's death, high schooler Mi-Hyang packs up her belongings and enters the household of her mother's formal manager. Even though she was a daughter of a rich man, with her father and other family members still alive and well, she apparently has good reasons for doing this... So the life of smiling 24/7 Mi-Hyang and the two good-looking sons of her mother's formal manager -- with their own set of unique personalities -- begins!!

The women in the Chidori family have the reigns firmly in hand. Then a cool young man appears among them as the mother's new assistant.

Asaichi can't play any instruments and his voice is average, and he's only in a band for the girls and the sex. Plus, he's homophobic. For some reason the new bassist Yoru is infatuated with him despite the treatment Asaichi gives him.

Included "Aru Otoko no Uta": the story of yakuza Onii chan and how he had come to know Yoru.

---
See also Yatamomo extra "Hashiyasume" - a crossover story

From Yaoi Is Life:

Hiroi always shared what he liked, things and people alike, with his childhood friend Take. Take always returned Hiroi's affections. Mine, who because of his deep love for Hiroi, accepts both of them. The relationship of these three classmates was in a good balance, but because of a subtle change in their feelings, this balance slowly gets unhinged...?!

Shin, Kouji and Yuki are childhood friends and schoolmates. One day, all of a sudden, Kouji and Yuki confess to Shin and attack him. How will Shin respond?

Izumi Seita, a gay, introverted, and pessimistic high school student, falls in love with Shinoya Toichi, his best friend. Shinoya is the complete opposite of Izumi. Before Izumi leaves for university, he gets his only chance to hold Shinoya. The sex they had seemed like a dream, but Izumi absolutely refuses to ruin his friend’s life and decides to try and forget about his feelings, even though it makes him miserable. But Shinoya won’t accept his decision…

From AOC Translations: A fast-paced heart pounding, and dangerous sonic love story!

Hina is busy managing the Apricot House in place of her father, but Anzu, the strange boy who lives in room 304 is quite the troublemaker.
One day, Hina accidentally breaks Anzu's keyboard and instead of asking Hina to pay for the damages, he asks her for favour after favour after favour! While this goes on, Hina discovers that Anzu is actually the charismatic vocalist for a super popular band!!! Is the lame weirdo that Hina knows the real Anzu? Or is the cool guy on stage? Hina's everyday life is changing rapidly.

From Paper Dolls Project:

Instead of her father, Hina is the one running the duties of the Building Manager in "Apricot House". One day, she accidentally destroys the keyboard of Apricot House room 304 strange resident. Hina is then asked by this strange guy to run errands for him as reimbursement. In truth, the strange guy residing in 304 is the charismatic vocals of the popular band ...... What will be his true face!? Chicks usually will change rapidly in the face of a cool stage -! Slowly, the world that Hina knows is changing. Experience this speed ​​of sound love story!

"An anthology of an adult puffing at blue smoke quietly" Various well-known mangaka look into the theme of cigarettes and smoking.

A mysterious transfer student arrives to the third year, class C for Hanazono Girl's Middle School.
Akane is a plain and simple girl who was tired of her over bearing Friends, and silently thinks that it is o.k for the world to be destroyed. However, all the girls of the class wake up to find themselves in a desolated school, with count down timers. Every girl is tied to another one, and this pair must survive a 7 day Battle Royal. As it turns out, Akane is tied down to the mysterious transfer student.

Friendships crumbles, hopes are lost and sanity is tested as the game starts of with a bang!

A shounen story where 2 teenagers went back in time to the "Three Kingdoms" period of China. An entertaining action series with some light moment & a bit of romance. You also get to learn a bit about that era.

From JanKenPon:
Middle schoolers, Shiro and Masumi, encountered a mysterious dragon that brought them back to the time of the Three Kingdoms; situated in ancient China. As soon as they arrived, they were rescued by the Han Kingdom. Not long after these events, Masumi was kidnapped and Shiro barely escaped death... Soon the story gets more complicated as they are stuck in the past.

In 1997, Ryuurouden won the Kodansha Manga Award for shōnen manga.

It's the year 2034 and high school student Sasaki Hiiro boards his bus just like any other day. Everything changes, though, when his bus is suddenly attacked by a mysterious girl with red eyes. When Hiiro awakes, he finds himself in "Tokyo," a city which was supposed to have been permanently sealed off after the outbreak of the deadly Pandora Virus ten years ago. Not only that, but it also seems like all those being gathered in "Tokyo" are developing new inhuman abilities. Now, among the ruins of Shibuya, Hiiro and his friends must discover why they are here and learn all they can about the terrible Malicious Code that is running wild in their bodies before it destroys them all!

Madoka is surprised to discover that her parents have won a 100,000,000 yen (one million dollar) lottery. To make things worse, they inform her of their decision to pursue their lifelong dream of becoming doctors. What will happen to Madoka who, when deciding to stay behind, is left to fend for herself in a family acquaintance's (the Asagi's) guest house?

Yuki is so ashamed of her figure that she refuses to go swimming, either at school or on the beach. She believes her ribs look strange, and hears that she can have plastic surgery to alter the appearance of her ribcage. Yuki goes to a nearby clinic that performs the procedure, but is told that she must pass a mental health assessment before she can have the surgery.

Includes:

1-3) Dreamers High
Ikuya is not interested in having a girlfriend or boyfriend. Ikuya's childhood friend Kishi just started going out with a boyfriend much older than him. Ikuya feels jealous of Daichi not because he's in a relationship, but because Daichi looks as if he's shining with happiness. But one day Ikuya accidentally saw Daichi and his boyfriend in their bedroom?!

4) In This Colorless World (Kono Iro no Nai Sekai de)
Miyamoto Kano presents the story of an ex-gangster and an elite office worker! "On the first snow day of the year, I let an outrageous man come inside. Inside my room, my body, and my heart."

5) Until the world ends (Soshite Sekai ga Owaru made)
Continuation of ch 4

5.5) Dreamers High Extra

--
Part of Rules / Hydra Series ?