One Reason是manglobe制作动画《死囚乐园》的片头曲，由fade演唱。
《死囚乐园》故事发生在东京大地震十年后。平凡的中学生五十岚丸太（朴璐美 配音）像之前一样每天上学放学，过着普通但幸福的生活，直到某一天，神秘的男子突降学校，把除丸太外的其他同学全部都杀掉了。目睹整个过程的丸太深受刺激，而等待他的却是更加残酷的现实。丸太被冠上了莫须有的罪名，进而被送往了号称“亡灵幻境”的死囚监狱。这个完全民营化的监狱还作为乐园让人参观，但乐园的真实身份却是为了筹集金钱，把死囚作为物品般研究和令其互相厮杀的不人道场所。丸太能在这样的世界生存下去吗，而在这里他又邂逅了曾经的青梅竹马小白…
歌词下方是One Reason钢琴谱，希望大家喜欢。
One Reason歌词：
Slit the throat of reason and reality
Cut myself and scream for their insanity
Wake up to this nightmare that will never end
Main attraction of this twisted master plan
Trust nothing but pain to get me through the daze
Sleep with one eye open not to be their prey
Fist against my face, they bring me to my knees
Pressures crushing down so hard, I can't break free
When I can feel my skin crawl
When I'm about to crack
The hunger for revenge gives me strength to stand
I will be your deadman
With nothing but this blood on my hands
Stuck in your wonderland
I just want to make you bleed like me
Everyday goes by without a second thought
Living in a perfect and controlled project
A puppet of their sick perversions' appetite
I'll be trapped inside this hell until I die
So what if no one cares
Enough to make a change?
I'd give my bleeding heart out for one reason
I will be your deadman
With nothing but this blood on my hands
Stuck in your wonderland
I wanna make you bleed just like me
So make me your deadman
With only poison in my veins
Stuck in your wonderland
Stagnated by the passivity
I'm gonna make you bleed like me!
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