Special Anime
Sword Art Online: Extra Edition

Kirito and the others decide to go on an underwater quest within the world of ALO to grant Yui her wish to see a whale. As they all prepare for the quest, they face a shocking revelation... Leafa, or Suguha is afraid of water. So, Asuna and the other female members decide to teach Suguha how to swim at a pool in the real world. Meanwhile, Kirito was meeting somebody…
[Source: Aniplex of America]
Kobayashi-san Chi no Maid Dragon: Valentine, Soshite Onsen! - Amari Kitai Shinaide Kudasai

Unaired special included with the seventh Blu-ray/DVD volume of the TV anime.
Steins;Gate: Oukoubakko no Poriomania

The setting is a few months after the end of the first season. On a calm day in Akihabara, Okabe and the other laboratory members are invited by Faris to go to America.
[Source: Steins;Gate Wiki]
Boku no Hero Academia: Ikinokore! Kesshi no Survival Kunren

In this brand-new adventure, some Class 1-A students are sent to hone their survival skills at a training course. Having yet to receive their provisional licenses, they’re eager to cut loose and have a little fun.
They quickly discover that the danger they face is no simulation! It’s going to take their combined training, teamwork, and quick thinking if they’re going to pass this assignment!
[Source: Funimation]
Kobayashi-san Chi no Maid Dragon Specials

Specials included with the Blu-ray and DVD releases of Kobayashi-san Chi no Maid Dragon.
Angel Beats! Specials

Unaired episodes of Angel Beats! included in the seventh volume of the Blu-ray and DVD, and another included in the Blu-ray Box.
Haikyuu!!: Lev Genzan!

Haikyuu!!: Lev Kenzan! tells an original story that reveals "a surprising side of a popular player."
[Source: Anime News Network]
Toradora!: Bentou no Gokui

An unaired episode included in the Blu-ray box set.
Yuusaku brings an extravagant bento box to share with the class, which makes Ryuuji feel inferior about his own bento making skills. Desperate to beat his bentos, Ryuuji obsessively tries to compete against them to the point where he even brings a rice cooker to school. After Taiga brings him some salty onigiri, Ryuuji realises that the true meaning of bentos is not the taste, but the feelings that are put into it.
[Source: Wikipedia]
Mob Psycho 100 Reigen: Shirarezaru Kiseki Reinouryokusha

A summary episode of Mob Psycho 100 which features commentary from Reigen Arataka.
[Source: MyAnimeList]
Nande Koko ni Sensei ga!? Special

Thirteenth episode of "Nande Koko ni Sensei ga!?" (Why the hell are you here, Teacher!?) included in the Blu-ray box.
Ansatsu Kyoushitsu

The story of the original manga begins after 70% of the moon was suddenly vaporized in an explosion. The super lifeform responsible for this catastrophe is a strange tentacled creature that can slink around at supersonic Mach 20 speeds. It has a 10 billion yen (US$100 million) price on its head, but for some reason, this creature ends up teaching a middle school class at the beginning of the school year. The students have until graduation to assassinate the teacher, or it will destroy Earth as well.
The event anime special will adapt the original manga's popular segment about the field trip to ancient Kyoto.
[Source: Anime News Network]
Musaigen no Phantom World Special

Unaired episode bundled with Blu-ray/DVD volume 7 of the TV anime.
Ansatsu Kyoushitsu: Deai no Jikan

Koro-sensei reminisces about his first meeting with Karasuma, where they first butted heads and fought against each other, ultimately coming to respect one another. However, Karasuma eventually points out their actual meeting wasn't nearly as eventful.
[Source: Anime News Network]
Sword Art Offline Extra Edition

Sword Art Offline included in the Sword Art Online: Extra Edition Blu-ray and DVD.
Owari no Seraph: Kyuuketsuki Shahal

The episode features an original story with original characters, and features a special mission that takes place before the decisive battle in Nagoya. The anime stars a mysterious vampire named Shahal and a human girl named Rikowhom he kidnaps. Shahal's true goal is unknown, and while he's kidnapped Riko, he refuses to drink her blood. Suddenly, he receives a visit from the vampire nobles Ferid and Crowley. Meanwhile, Guren tasks Shinoa's squad with rescuing Riko and returning her to her family.
[Source: Anime News Network]
Kaichou wa Maid-sama!: Omake dayo!

Extra episode included in Blu-ray and DVD volume 10, entitled "Omake dayo (It's an extra!)".
Fate/Grand Order: Zettai Majuu Sensen Babylonia Episode 0 - Initium Iter

2017 AD. The last era in which Magecraft still existed. Society was created by human hands, but Mages grasped the truth of the world. Magecraft is comprised of techniques from past humans that cannot be explained by science, while science encompasses the techniques of future humans that Magecraft cannot achieve.
[Source: AnimeLab]
To LOVE-Ru Darkness 2nd Specials

Extra episodes of To LOVE-Ru Darkness 2nd bundled with the seventh Blu-ray and DVD volume.
Overlord: Ple Ple Pleiades (OVA)

30 minutes of new chibi anime short series footage bundled with the novel series' 11th volume.
The new anime will feature the appearance of the Pleiades combat maids, as well as the rest of the Floor Guardians.
Pokémon: The Origin

The anime will feature the player and rival characters from Nintendo's original Pokémon Red and Pokémon Green (released as Pokémon Blue in North America) video games.
[Source: Anime News Network]
Guilty Crown: Lost Christmas

A DVD with an animated short bundled with the limited edition of the PC game "Guilty Crown Lost Christmas".
In 2029, Scrooge escapes from a research facility where he had been confined as an experimental subject. His body was remodeled by genetic manipulations and he uses his psychic power to kill the chasers. One day, he meets another experimental subject called Carol. When three psychic chasers hunt down the two, Carol asks Scrooge to use his right arm to extract a weapon from her body.
[Source: MyAnimeList]
Shinmai Maou no Testament Specials

Specials included on the Blu-ray/DVD volumes.
Episode #1: A 3 minute short featuring Mio and Maria.
Hai to Gensou no Grimgar Special

Original unaired episode "2.5" included with the first Blu-ray and DVD volume that will expand on the ending of episode 2.
Toradora!: SOS!

DVD shorts featuring the miniature forms of the Toradora characters talking about, and eating, food.
[Source: MyAnimeList]
One Piece 3D2Y: Ace no shi wo Koete! Luffy Nakama Tono Chikai

This new TV special tells the two years of Luffy's training with Silvers Rayleigh in Rusukaina Island after the Battle of Marineford, which has never been told in the manga or TV anime. It also features a new villain named Burndy World who is known as "The Destroyer of the World" and has the power of the MoaMoa Fruit (its ability is still unknown). Luffy has to protect Boa Hancock from the new enemy who escaped from the level 6 of Impel Down. He is newly designed by the original creator of the manga, Eiichiro Oda.
[Source: Crunchyroll]
Kuroko no Basket: Tip Off

Episode 22.5 bundled with BD/DVD volume 8.
The episode covers Kuroko's past, when he was part of the "Generation of Miracles."
[Source: MAL]
Naruto Shippuuden: Sunny Side Battle

Original Anime will feature the "unbelievable appearance of a certain popular character."
Darker than Black: Kuro no Keiyakusha - Sakura no Hana no Mankai no Shita

A new breed of covert agents known as Contractors prowl the underworld. These assassins and spies wield bizarre supernatural powers, spilling blood on both sides of the law. One of these operatives is deadlier than the rest—the masked killer BK201, the Black Reaper. His identity and intentions are unknown, but it’s clear the rules of engagement have changed.
[Source: Funimation]
Inu x Boku SS Special

Unaired episode released with the seventh volume of the Blu-ray & DVD. It consists of three short episodes newly written by the manga author Fujiwara Cocoa. Fujiwara also designed a new character called Hana-chan for the episode.
[Source: MyAnimeList]
Tanaka-kun wa Itsumo Kedaruge Specials

Special episodes bundled with the Blu-ray and DVD volumes of the TV anime.
Keijo!!!!!!!! Specials

"Completely new bonus anime" included with each of the six Blu-ray/DVD volumes.
Ore ga Ojou-sama Gakkou ni "Shomin Sample" Toshite Gets♥Sareta Ken Specials

Kujou-san no Do-S Soudanshitsu Anime-ban short anime specials bundled with the Blu-ray and DVD releases of Ore ga Ojousama Gakkou ni "Shomin Sample" Toshite Gets♥Sareta Ken.
[Source: MyAnimeList]
Free! Eternal Summer Special

Unaired episode included with the seventh Blu-ray/DVD volume of "Free! Eternal Summer".
[Source: MyAnimeList News]
Granblue Fantasy The Animation: Extra 2

Unaired episode included with the seventh Blu-ray and DVD volume of the "Granblue Fantasy The Animation" TV anime.
Machine-Doll wa Kizutsukanai Specials

OVAs bundled with each of the six Blu-ray/DVD volumes.
Volume 1: "Soshite Futari wa Manabisha e (Then The Two Goes to Learning Dorm)"
Fate/kaleid liner Prisma☆Illya 2wei Herz!: Beast, Futatabi!

The official website of the Fate/kaleid liner Prisma Illya anime franchise revealed on Friday that the Blu-ray Disc volumes and the limited-edition DVD volumes of the Fate/kaleid liner Prisma Illya 2wei Herz! anime will each contain a five-minute episode of a short anime titled "Beast, Again!" (Beast, Futatabi!).
[Source: MAL]