真壁一骑是个生长在对日本而言十分乡下的龙宫岛上的少年──对他来说，像这样的和平是普通到不能在普通的状况。
但当由硅所构成的不明生物·异界体（Festum）开始攻击龙宫岛时，他才开始注意到他现在所拥有的和平生活不过只是个被创造出来的假象。
为了取回自己的和平生活，他和同伴开始一起搭乘人类所创造出来的巨大兵器·法夫那（Fafner）和异界体战斗──
在激战的彼端，等待着他的是……

Light Yagami is an ace student with great prospects—and he’s bored out of his mind. But all that changes when he finds the Death Note, a notebook dropped by a rogue Shinigami death god. Any human whose name is written in the notebook dies, and Light has vowed to use the power of the Death Note to rid the world of evil. But will Light succeed in his noble goal, or will the Death Note turn him into the very thing he fights against?

The messy emotions of Hachiman, Yukino and Yui won't be easily expressed, and as the members of the Service Club band together to host a school prom, they will have to put their feelings into words and truly learn to understand each other at long last... if the Service Club can even stay afloat, that is!

Hachiman Hikigaya is an apathetic high school student with narcissistic and semi-nihilistic tendencies. He firmly believes that joyful youth is nothing but a farce, and everyone who says otherwise is just lying to themselves.

In a novel punishment for writing an essay mocking modern social relationships, Hachiman's teacher forces him to join the Volunteer Service Club, a club that aims to extend a helping hand to any student who seeks their support in achieving their goals. With the only other club member being the beautiful ice queen Yukino Yukinoshita, Hachiman finds himself on the front line of other people's problems—a place he never dreamed he would be. As Hachiman and Yukino use their wits to solve many students' problems, will Hachiman's rotten view of society prove to be a hindrance or a tool he can use to his advantage?

故事背景为日本的江户时代，风是一家小茶馆的侍女，这天茶馆里来了一群地方恶霸，其中地方官儿子龙次郎尤其欺人太甚。风因为意外得罪了龙次郎，情急之下，茶馆内一名无职浪人“无幻”出手救了风。另一方面，地方官正在欺压老百姓，流浪武士“仁”路见不平拔剑相助，杀死了地方官身边的四个“高手”保镖，救下了穷人，因此得罪了地方官。
随后，无幻和仁在茶馆里相遇并交手，忽然一场大火将他们困住，二人随之被捕。因儿子在大火中丧生，恼羞成怒的地方官勒令将二人砍首。砍首之日二人大闹刑场，并且在风的帮助下，从刑场中逃出来了。作为代价，风要求他们一起去寻找一个身上“带着向日葵香味”的武士。从此，三人展开了一场奇幻的旅程。
《混沌武士》由渡边信一郎监督，全片彰显了独特的浮世绘加现代Hip-Hop风格。本动画获选为2004年第八回日本文部省文化厅媒体艺术祭动画部门推荐的作品。