《假面骑士Build:只有一个答案》是由上堀内佳寿也执导,犬饲贵丈,赤楚卫二,高田夏帆,武田航平主演的剧情片。该电影于2018年在日本上映。故事从战兔在公路上骑着摩托车,接到美空和纱羽姐的电话开始。万丈去参拜香澄(女朋友)的墓,一海去参拜三羽鸦的墓,幻德则睡觉。三都的知事的演说开始了,战兔将一对姐弟从Smash那解救了出来。因为伊能贤吾的洗脑,民众们向战兔袭来。火星灭亡后,为了毁灭地球,Blood族在这10年里,一直作为影子暗中活动。Evolto因为没参与其中,导致三人被灭亡。战兔在逃跑的途中,突然出现了两只狗,看到狗实在太可爱了,战兔忍不住为其拍照。结果不巧被民众发现了,又跑了出去。足球场的应援席里,一海与幻德达成一致。但是这时北都知事---才贺涼香出现了,并变成剪刀Smash,与Rogue和Grease打了起来。听到是乡原光臣当初提出把香澄变成Smash的,万丈立刻变成Cross-z Magma,与变身成斑马Smash的光臣打了起来。但是这时,伊能贤吾现身,将万丈洗脑了。战兔为了调查【极计划】,这时伊能贤吾与被洗脑的万丈现身了,万丈变身成Great Cross-z向战兔袭来。战兔也变身为Rabbit Rabbit形态迎战。可是被斑马Smash和剪刀Smash抓住不能动弹,又受到Great Cross-z的【Great Dragon Finish】的重击,导致变身解除了。一海和幻德被才贺涼香抓住了,这时内海出现了说想要挤压腰带就下跪吧。只有幻德下跪了取回了腰带。变身解除的战兔被万丈夺走了危险扳机,交给了伊能贤吾。与剪刀Smash、斑马Smash和万丈三人一样,伊能贤吾使用【伟大穿越龙】、【眼镜蛇迷失满瓶】和【危险扳机】变身成了假面骑士Blood。就在Blood要给肉身的战兔致命一击的时候,Evolto为救战兔而赶来了。
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