Yuichi hasn’t seen his cousin Nayuki in years. Now that he’s back, all knowledge of ever visiting has vanished. He tries to adjust to the vaguely familiar surroundings, but the gaps in his memory haunt him as time grows short. The pieces of the puzzle have appeared – an eerily silent beauty with blazing tresses, the mysterious girl with the winged backpack, and the sword-wielding demon slayer – but it’s up to Yuichi to discover how they fit together.

【STAFF】
原作：Key/ビジュアルアーツ
监督：石原立也
系列构成・脚本：志茂文彦
人物原案：樋上いたる
人物设定・总作画监督：池田和美
动画制作：京都アニメーション
【CAST】
冈崎朋也：中村悠一
古河　渚：中原麻衣
藤林　杏：広橋　涼
藤林　椋：神田朱未
坂上智代：桑島法子
伊吹风子：野中　藍
一之濑琴美：能登麻美子
春原阳平：阪口大助
古河秋生：置鮎龍太郎
古河早苗：井上喜久子
相乐美佐枝：雪野五月
宮沢有紀寧：榎本温子
【主题歌】
OP：時を刻む唄（曲：麻枝准・折戸伸治、ボーカル：Lia）
ED：TORCH（曲：折戸伸治、ボーカル：Lia）

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.

《人类衰退以后》是田中罗密欧所著、山崎透担任插图绘制的日本轻小说作品。作为Gagaga文库的创刊轻小说之一，从2007年5月开始刊载至今，历经4年销量一直保持良好。
故事的时代背景是现在的人类衰退之后经过了好几个世纪，人类因为不明原因而导致出生率严重下降，未来人类的人口 大幅锐减，不要说发展，连文明的传承都没有办法了，人类正慢慢地退出历史的舞台。而取代人类出现在地球上的则是一种很像童话故事中才会出现的不明生物妖精。妖精的平均身高只有10公分，三头身的妖精们却拥有高度的智慧，而且非常喜欢吃糖果点心。作为最后一届的毕业生女主角（中原麻衣 配音）毕业之后就回到故乡樟树之里去接续祖父的工作，成为负责斡旋在妖精与人类之间的重要国际公务员“调停官”。虽然如此，由于妖精很少跟人类接触，因此她根本没啥工作可作，因此她想要好好研究妖精的生态。

Japanese anime television series

A special recap of the first season with an original story in which Kirito and the others decide to go on an underwater mission so that Yui can see a whale, but they face a shocking revelation... Suguha is afraid of water. So Asuna and the other girls decide to teach Suguha how to swim. Meanwhile, Kirito is meeting somebody.