From Omari's Sister:

"Pika Ichi" is the story of two painfully shy teens who love yakuza movies. An incident at school pushes them over the edge, and they decide to drop their mousiness in order to dispense some "justice."

1-3. Shining Days
The strong-willed Asahi and the easy-going Tetsuro have been close friends since kids. Now in high school, those two still “share” their bento. However, Asahi is asked to stop bullying Tetsuro, “because he’s too nice to tell you his true feelings!” But is that really how Tetsuro feels about Asahi’s bullying—?

4. Fireworks
Morio invite Saeki to the local fireworks festival but receives the usual cold response from Saeki. Follows Morio and Saeki-sensei from Vanilla.

5. Anniversary
Nakajima is unsure about his relationship status with Yajima, They have been going out for weeks but nothing physical has yet to happen between them. Follows Nakajima and Yajima from Vanilla.

6) Lost Pain
Nakajima is unsure of Yajima's love for him despite the constant declarations of love. The problem? Nakajima finds it hard to take Yajima seriously when all he can see is his poker face. Follows Nakajima and Yajima from Vanilla.

7. The Prince's Secret
The prince admits his past history to his lover, hoping he will display some signs of jealousy. The sequel to Hashire! Oujisama. Scanlated by Obsession as DJ for Hashire! Oujisama.

8. The Standard Equation of Love
A friend confesses to stealing his girlfriend to his childhood playmate, hoping to get a rise out of him.

Naruto Shiohito, a cook at a not really well known and not that great ramen shop has his day shaken up by a cockroach...that's transformed into a cockroach girl!

From Doko Demo Doa Manga Scanlations:

Contains short stories of a little rabbit, Sentarou, with his clumsy owner, Baku, who are always happy spending their spring time together.

In the Pikupiku Sentarou Selection series:

V.1 - Funwari Haru no Maki

V.2 - Kirakira Natsu no Maki

V.3 - Oishii Aki no Maki

V.4 - Hokahoka Yuki no Maki

From Wikipedia:
Pilgrim Jäger is a historical fiction that takes place in Europe in the year 1521, at the time of the Protestant Reformation. The story follows two women, Adele the acrobat and Karin the fortuneteller. Afraid of being accused of witchcraft, they disguise their special powers, working as common performers (professionisti) to earn enough money to buy indulgences from the Catholic Church that will hopefully free them from their sins. However, their powers soon get them involved in a great religious battle involving the Medici family, the Este family, Girolamo Savonarola's "prophecies," and many others.

Pairing:
Aoki x Mizusawa, Tsukishima x Yamaji

From Manga Abyss:

In the world of Kabuki, where family social standings are highly valued, Kyonosuke is inept even though he is born as the son of a duke of a famous household. Ichiya while being born in a family that has no connection to Kabuki, is trying to move from the absolute lowest rank to the top using just his ability. Through some kind of karma, these two completely opposite boys have fallen in love with the same girl, Ayame.
That’s where the story begins.
Kyonosuke, who wants to be liked by the Kabuki loving Ayame, cries tears of regret because he would throw away all his powerful connections if he could only have real ability. But what if Ichiya, who wants to be the center of Ayame’s attention, was adopted into a famous household…?

Pin to Kona won the 57th Shogakukan Manga Awards.

A doujinshi co-authored by Kawahara Reki, under the pen-name of Kunori Fumio, and Kurusu Tatsuya on Sword Art Online.Note: Part 4koma/novel doujinshi. Novel (not included) by Kawahara Reki, 4koma by Kurusu Tatsuya.

Yui, Minami and Saeka are new found friends. On their way to class, a life changing event took place and has transformed them from ordinary school pinafore girls into “Pinafore Schoolgirls” superheroine.

From Evil Flowers:

The story of the growing up of a high school student that hates spring and has a phobia for flowers.

A young man experiences his first heartbreak.

Pineapple Army is a story about a legendary Japanese ex-mercenary, working as a self-defense instructor. He is sent all around the world for a job by an international self-defense agency, and in each episode, there is a human drama. Along the way, he also saves the world a few times from the hands of terrorists.

In the modern age, there remain many martial art clans from long ago, all of which are vying for power. Amidst a fight, the son of a security man meets a mysterious girl who kisses him out of the blue...

From Shogakukan: Ping pong. Table tennis. Fast, furious. You might have seen it, even played it, but you've never seen it like this! The action centers around "Smile" Tsukimoto and "Peco" Hoshino, two high school students in the midst of adolescence and out to prove they've got what it takes in the cool, cruel world of sports. This manga even got adapted into a live-action movie.

Inaho Jr. High's Boys Ping Pong Club has only 6 members, the club minimum. Takeda is your average nice guy. Kinoshita is good looking and popular with girls. Unfortunately, the rest are branded as losers. Tanabe is too foreign, while Tanaka is petite and perverse. Maena and Izawa are truly deviant, and their crazed antics have earned the team some powerful enemies. In spite of their differences, the team needs to work together to retain their practice room and club status.

Note: Won the Kodansha Manga Award for general manga in 1996.

A story about two people with mental problems protecting everything they left with their only method, playing ping pong.

A story about two people with mental problems protecting everything they left with their only method, playing ping pong.

Pink is the story of a young high school student named Usagi who is trying to become a porno manga artist. Who would've figured that out of a such a cute, innocent blond boy? Guiding him is Benio, the original artist of the story that Usagi is working on. Benio at first seems to just want to teach, but then finds himself getting a little too interested in teaching Usagi how to get into that, er, certain frame of mind for drawing adult porn.
Now enter in Usagi's father, an attractive, sexy man who is more than a little interested in Benio, and makes no move to hide it both from Benio and his own son. And who could resist that? Who would want to?

Collection of seven oneshots with various themes (hard yaoi).

1) Pink Butterfly

2) Going to Ocean’s Home for Summer Holiday

3) A Night when the Moon’s Smiling

4) New Teacher

5) Fraud

6) Together with You

7) A Present Picked Up in the Rain

A one volume anthology of four loosely connected stories, each with a color as its theme! Pay attention--these stories have some minor character overlaps~ You may see somebody again as a background character!

Story 1: Pink Choodai
Hitomi feels insecure and unconfident in her boyfriend, Satoshi's, love for her. So what's the best way to find out if he loves her? What?! Playing around with other guys?

Story 2: An Overflow of Blue
Haruka loves Satoshi, who already has a girlfriend, Hitomi. Haruka's coworker NAKAMURA Makoto loves Haruka. Problem is, Haruka hates Makoto. What should she do in this mess?

Story 3: Lying Yellow
How far will Mariko go to confess to a guy who's too shy to make the first move? A transfer student, Yuri, only makes the situation more complicated then ever!

Story 4: White Mask
Yuri shows her great love for her childhood friend Makoto... but why can't she date him?

Actual Event Timeline:
White --> Yellow --> Pink/Blue