In Tokyo's downtown district of Ikebukuro, amidst many strange rumors and warnings of anonymous gangs and dangerous occupants, one urban legend stands out above the rest—the existence of a headless "Black Rider" who is said to be seen driving a jet-black motorcycle through the city streets. Mikado Ryuugamine has always longed for the excitement of the city life, and an invitation from a childhood friend convinces him to move to Tokyo. Witnessing the Black Rider on his first day in the city, his wishes already seem to have been granted. But as supernatural events begin to occur, ordinary citizens like himself, along with Ikebukuro's most colorful inhabitants, are mixed up in the commotion breaking out in their city.

由于眼部受伤，前轻量级拳王神田英司（宫野守真 配音）即将永远的告别他所热爱的拳击事业，于此同时一去不复返的，是英司对生活的热情和不懈的奋斗。一次偶然中，英司来到了一间名为“西洋古董”的西式糕点店，被香甜美味的糕点治愈的英司当即决定，要在这里学习，成为一个合格的糕点师。 在店中，英司结识了各路有趣的人等。平时敦厚老实，但一到夜晚就会变身为“魔性的同性恋”的小野裕介（三木真一郎 配音）；身为糕点店的所有人却非常讨厌吃甜食的橘圭一郎（藤原启治 配音）；橘的忠犬守护者，患有女性恐惧症的小早川千影（花轮英司 配音），这些表面上大大咧咧的作者们，在英司看不见的过去中，其实都藏有着悲伤晦暗的回忆。