The Unfitting Puzzle Piece

GL

Lisa is a school girl that wants to know the secret about  Eva’s perfect life, and she will soon, but what she’ll find is not she was expecting from her flawless classmate…

Museum

Horror Seinen

Police squad inspector Hisashi Sawamura gets involved in a serial-killer case that puts his family in deadly peril. (Source: MU) Included one-shot: Volume 2: Girl and Killer (Onna to Koroshiya) Also includes Bokura wa Shinyuu to Iu Karada de series.

Wonderland Museum

Adventure Fantasy Sci-Fi

Piece

Mystery Drama Romance

One day, Mizuho, a university student, receives news that her classmate in high school, Origuchi Haruka, passed away. Mizuho doesn't remember being best friends with Origuchi, but apparently, Origuchi told her mother that Mizuho was her best friend. And now, her mother wants Mizuho to help her find the boy Origuchi dated during high school. Mizuho told Origuchi's mother that Origuchi was a very plain girl, and she was never seen with a guy, but her mother told Mizuho that Origuchi got pregnant and had an abortion when she was in high school. Mizuho was shocked, but she still starts asking her other classmates in high school and following the traces Origuchi left behind. (Source: Aerandria)

Mystic Museum

Mystery Supernatural

One Piece

Action Adventure Comedy

Gol D. Roger, a man referred to as the "Pirate King," is set to be executed by the World Government. But just before his demise, he confirms the existence of a great treasure, One Piece, located somewhere within the vast ocean known as the Grand Line. Announcing that One Piece can be claimed by anyone worthy enough to reach it, the Pirate King is executed and the Great Age of Pirates begins. Twenty-two years later, a young man by the name of Monkey D. Luffy is ready to embark on his own adventure, searching for One Piece and striving to become the new Pirate King. Armed with just a straw hat, a small boat, and an elastic body, he sets out on a fantastic journey to gather his own crew and a worthy ship that will take them across the Grand Line to claim the greatest status on the high seas. [Written by MAL Rewrite]

Missing Piece

Shoujo

High school girl Ai had a strange dream about a childhood past in which she was rescued by a little boy who promised to protect her. The dream seems like a fragment of her memory but she does not have any recollection of the past. Things start to get stranger when there is a guy in her class whom she does not recognize at all. It seems that everyone in the class knows about Akizuki Tooru except for her. Sensing something strange about Tohru, Ai went to conduct an investigation on him and found that the school has no records of him. After confronting him, Tohru eventually admits that he is an ESPer who has infiltrated into the school to investigate on the string of drug-overdose deaths that have been happening in school. This begins the story of Ai's involvement in the life of Tohru and the dangerous events behind the investigation... (Source: ANN)

One Piece Party

Action Adventure Comedy

Spin-off of One Piece, which takes place post-timeskip, showing the cast in SD/chibi form and features their hilarious antics around various islands while out in the sea.

Koisuru One Piece

Comedy Romance Shounen

The premise of this gag manga spinoff is about three high school students: a young male student, his girlfriend and a third wheel who is a One Piece fanatic. Their names are similar to the Straw Hat Pirates and the group form a fan club dedicated to One Piece. Each chapter is a parody of the series. (Source: One Piece Wiki)

One Piece: Loguetown-hen

Action Adventure Comedy

One Piece: Loguetown Arc is a novelization of Eiichiro Oda's intended story elements for the Loguetown Arc, later used in the anime as a filler. (Source: One Piece Wikia)

Piece of Cake

Drama Romance Josei

How a young woman, romantically and professionally broken, will once again get a taste for life when she leaves the city to live in the countryside... Shino feels totally lost in her life. She goes out with a past work colleague, Masaki, quite macho...and troubles at her work make her leave it. She moves out, takes her independence, moves away from Masaki and settles in a tiny room in an old building of suburbs. On her arrival, she finds a little garden she shares with her neighbours, a couple her own age. And little by little, she feels more and more attracted to the mysterious man who lives next door. (Source: Shoujo Manga Maniac)

One Piece: Strong World

Action Adventure Comedy

One Piece: Strong World is a special prologue chapter to the 10th One Piece movie, Strong World. This one-shot depicts events 20 years before the current timeline of the manga. The main focus is the relationship between Shiki, the Golden Lion and Roger, the Pirate King. In addition, it shows what other characters were doing 20 years ago. [Written by MAL Rewrite]

One Piece Log Book Omake

Action Adventure Comedy

Interestingly, one of the features that most of the Logs share are the publication of some omakes, an English loanword in Japanese for remakes. Those remake comics are three-page ones that tend to parody other genres. Those side comics were drawn when Oda was given three sheets of blank paper by his editor and told to draw anything. Animated versions, subtitled as Mugiwara Theater, were broadcasted on October 2006 along recap episodes 279 to 283. They featured omakes released from 2nd to 7th Logs. Some omakes were released outside of the Logs. They're listed below with the others: * Blue Databook 4 koma (8 pages) * The 2nd Log: Report Time * The 3rd Log: Obahan Time * The 5th Log: Jingi-nai Time * The 6th Log: Chopper Man * The 7th Log: Monster Time * Yellow Databook: Space Time * 10th Treasures: Third Year Class SEA Time * The 10th Log: Märchen Time * The 13th Log: Family Time * The 14th Log: Ed Sullivan Show * The 15th Log: Detective Loomes * The 16th Log: Circus Time * The 20th Log: RPG Time Chopperman has starred in the animated New Year's Special filler that aired on December 23 2007. Episode 369 also featured a special Easter egg referring to Chopperman when Oz suddenly discovered the cockpit in its stomach and called itself "Oz Bomber." (Source: One Piece Wikia)

One Piece x Toriko

Action Comedy Shounen

One Piece x Toriko cross epoch

Sokuseki Sentai Love & Piece

Shounen

None.

Ohana Moyou no One-Piece

Romance School Shoujo

Tomboyish Ayuka is in love with her childhood friend Sakamoto. At the start of her third year of middle school she meets a new friend Sally-chan. Sally-chan also seems to have feelings for Sakamoto. Will Ayuka have the courage to confess her feelings or will Sally-chan beat her to it? (Source: Alice Dreams)

Tsuki to Taiyou no Piece

Romance School Shoujo

During her 1st year of High School at Christmastime, Mimi met two handsome boys with really bad personalities. After advancing to 2nd year, all three of them ended up in the same class where they became the class representatives. (Source: MU)

One Piece: Taose! Kaizoku Ganzack

Action Adventure Comedy

While Luffy and his crew of Zoro and Nami are starving on their small boat, they are attacked by a large monster. Nami is taken away, while Luffy and Zoro wash up on shore. There they meet a young girl, Medaka, and learn of the sad history of the island. The evil Pirate Ganzack has taken away all the men in the village and enslaved them, including Medaka's father. Now Luffy, Zoro, and Medaka must infiltrate Ganzack's base in order to rescue the villagers and Nami. (Source: ANN)

One Piece: Koby-ni no Kobiyama - Uri Futatsunagi no Daihihou

Comedy School Shounen

The manga revolves around a normal student that looks like the popular One Piece character Koby. Included one-shot: Volume 3: Chiyoko-chan wa Dojicchau