漫画中本篇故事的前日谈作品，描述艾利亚斯·恩滋华斯的从前，以及尚未与其接触的羽鸟智世幼年时代，是原著中没有被描绘出的故事。

Japanese anime television series

E-Rantel, the capital city of the newly established Sorcerer Kingdom, suffers from a dire shortage of goods. Once a prosperous city known for its trade, it now faces a crisis due to its caution—or even fear—of its king, Ainz Ooal Gown. To make amends, Ainz sends Albedo to the city as a diplomatic envoy.

Meanwhile, the cardinals of the Slane Theocracy discuss how to retaliate against Ainz after his attack crippled the Re-Estize Kingdom's army, plotting for the Baharuth Empire to take over the Sorcerer Kingdom. However, when Emperor Jircniv Rune Farlord El Nix arranges a meeting with the Theocracy's messengers at a colosseum, he is confronted by none other than Ainz himself.

With their secret gathering now out in the open, the emperor and his guests learn that Ainz has challenged the Warrior King, the empire's greatest fighter, to a duel. With Ainz's motivations beyond his comprehension, Jircniv can do nothing but watch as humanity's future changes before his very eyes.

Japanese original video animation

天野明所著漫画《鸭乃桥论的禁忌推理》动画化企划进行中

Japanese anime television series

Japanese anime television series

Japanese anime television series

Japanese manga series

以漫画原作为基础最早动画化的十集OVA作品。

Japanese original net animation series

Tomoya Okazaki is a third year high school student resentful of his life. His mother passed away from a car accident when he was younger, causing his father to resort to alcohol and cigarettes. This results in fights between the two until Tomoya's shoulder is injured in a fight. Since then, Tomoya has had distant relationships with his father, causing him to become a delinquent over time. While on a walk to school, he meets a strange girl named Nagisa Furukawa who is a year older, but is repeating due to illness. Due to this, she is often alone as most of her friends have moved on. The two begin hanging out and slowly, as time goes by, Tomoya finds his life shifting in a new direction.

2004年发售OVA版，共3集。故事主要描写原作故事最初到主人公继承“Phantom”之名的过程。

奥京都から逃げてきた鈴木凛（小鉄）は、かつて兄のいた東京の探偵事務所の所長、久遠美保のもとに身を寄せる。一方、裏社会で傀儡師として有名な御門竜也は、久遠美保殺害の依頼を受ける。そのためには小鉄が障害になると考えた竜也は、小鉄を狙う。だが、何度か対決して行くうちに、2人は徐々に意識しあう仲になってしまう。やがて、依頼人が自殺したことにより、竜也は小鉄を狙う理由はなくなった。以後竜也は小鉄の味方になるとともに、2人の仲も次第に深まる。そんな中、東西に分かれた裏社会のうち、竜也たちの属する東側に、西側の人間である影鰐が入りこんでくる。これがきっかけで東西の裏社会どうしで騒動が起き、小鉄たちもその中に巻き込まれていく。様々な難敵との闘いや出来事の末、裏社会の騒動は東側の勝利に終わった。

In the year of 1996, the Soshiki organisation led by Adel, was crushed by the hands of Eiji, Kayin and Ellis. After the Soshiki's reign of terror, all was thought to end the one-on-one battles. It was all a legend, until now. Now, in the year 2006, Eiji learned of some sacred weapons that could bring him all the power in the world, therefore, corrupting Eiji with an Evil Aura. Eiji then started a team of genetically engineered beings to help him with his idea of becoming an ultimate god. It is up to Eiji's son, Subaru, Kayin's little sister Naru, hopelessly flirtatious Rook Castle, Angel Girl Puella (and who also happens to be the daughter of past Toshinden fighter, Ellis.), Wild boy Fen, Prince Lancelot, Wise seer Genma, Ninja woman Miyabi and great robot Bang Boo to set up their own individual teams to compete with each other, as well as stopping Eiji and his minions (Eos and Zero) from becoming gods as well.

被突如奇来的宇宙侵略者S．E侵占地表以来，已经过了一百年，现在是新西历302年。人类仍然不知道侵略者的真正面目，少数人潜入海底深处的AQUABASE中苟延残喘活下来。

地处新香港市的一个喧嚣夜晚，一度沉缅立体格斗的美剑阳菜(池泽春菜 配音）和夏树、惠美正在巨蛋体育馆观看精彩纷呈的异种格斗，突然之间体育馆内出现剧烈爆炸。阳菜从短暂的昏迷中醒来，发现自己被号称GOMA四天王之一的真红之莎菲亚摄入一个异度空间。危急时刻，冷静沉着的仙蒂·撒哈尼（桑岛法子 配音）出面拯救了她。连番激战过后，阳菜体内蕴含的力量觉醒，实现变身。随后，凤丽华（木村亜希子 配音）也加入战斗中。另一方面，阳菜的父亲随某考古学家探究远古文明的秘密，无意中启动了古文明的动力装置。世界开始面临前所未有的改变……
本片根据大张正己和青树零梦的原作改编。

《秘封活动记录》由中国同人社团“京都幻想剧团 ”创作的东方project二次同人OVA动画。
本作以秘封组二人的视角展开，描写了过去发生在幻想乡的种种故事。
正式版为日语配音，多个日本声优参与演出。

惠斯勒王国的公主弥涅耳瓦为了选拔自己的亲卫队而举行了一场武艺大赛，但其护卫布鲁莫莉丝却遭到神秘术士团体的绑架。为了救出挚友，弥涅耳瓦和几位自愿同行的女战士一起出发……