影片根据兵器真人化游戏《刀剑乱舞ONLINE》改编，刀剑男士们将介入织田信长、丰臣秀吉的“本能寺之变”。

惨遭雷击而死的阿纶（柯震东 饰）来到阴间，生前所有的记忆归零。他必须做出选择：投胎转世却可能变成蜗牛；或是担任神职，累积阴德再修转世为人的正果？阿纶决定成为月老新鲜人，他与个性爆冲粉红女Pinky（王净 饰）搭档，来到人间执行任务，当阿纶遇见狗狗阿鲁以及牵着他的主人小咪时，他前世的记忆都回来了，小咪（宋芸桦 饰）就是他生前的挚爱。阿纶希望能帮助阳间的小咪寻得新的姻缘，但每一条绑在小咪手上的红线竟然都被烧毁。原来，有些事，一万年也不会变……同一时间从阴间逃到人间的鬼头成（马志翔 饰），展开腥风血雨的复仇行动，找上五百年前背叛且杀害自己的马贼兄弟。当阿纶还在为小咪绑不上红线雀跃时，鬼头成却将小咪视为下一个要毁灭的目标……

故事讲述了风靡十年的超人气热血IP《排球少年!!》中人气最高、最精彩绝伦的垃圾场决战。日向翔阳因为心怀成为“排球小巨人”的梦想加入了乌野高中排球部，逐渐成为独当一面的副攻手。春季高中排球比赛上，乌野高中排球部终于迎来了与音驹高中排球部的正式比赛。同为“没落的豪强”，两支队伍惺惺相惜，却从未站上过同一场正式较量的舞台。长久的纠葛终于迎来了结，一场“只有一次”的命运对决即将开幕！振翅一击吧，心怀梦想的少年们！

（转自IMDB）Everything returns to normal after Chernobyl. That is, everything but art. Most of the great works are lost, and it is up to people like William Shakespear Junior the Fifth to restore the lost artwork of the human race. He finds strange goings-on at a resort enough to remind him of all the lines of the play, dealing with mob boss Don Learo and his daughter Cordelia, a strange professor named Jean Luc-Godard (sic), who repeatedly xeroxes his hand for no particular reason. He is followed by four humanoid goblins that keep tormenting Cordelia. There is also the gentleman whose girlfriend, Valerie, isn't always visible. Then the film is sent off to New York for Mr. Alien to edit.