Everyone been wondering why Yonezu (last name) Kenshi (first name) is wearing the heeled shoes. In one of his interviews he said that once he dreamed a funeral. Everyone was sad, but suddenly someone in the first line started to whistle loudly, in a way that annoyed the other people. They all started to say that he wasn't respecting the dead person because he wasn't being in silence for him, but Kenshi knew that the man whistling was communicating with the dead one. That was their own unique way to recognize each other. Maybe the others will think you're crazy or something negative, but it won't change the love that the whistling man has for his dead friend. Turns out that Kenshi got inspired by this dream so in the sing he wore heeled shoes, because he wants to let us know that he doesn't care what others say, it's his special way to express himself, because Kenshi was affected by High-functioning Autism which brought him to be smarter than the average, but he couldn't handle with social relationships, that's why he never had many friends since a young age and everyone made fun of him because of his character.
米津（姓）ケンシ（名）がなぜヒールの靴を履いているのか、誰もが不思議に思っていることだろう。
彼はあるインタビューで、葬式の夢を見たことがあると言っていた。みんな悲しんでいたのに、突然一列目の誰かが、他の人たちを困らせるような大きな口笛を吹き始めた。
彼らは皆、口笛を吹いているのは死者に敬意を払っていない、死者のために黙っているのではない、と言い始めた。それが彼ら独自の認識方法だったのだ。
もしかしたら、他の人からは頭がおかしいとか否定的な見方をされるかもしれないが、口笛を吹いている男が死んだ友人を愛していることに変わりはない。
というのも、ケンシは高機能自閉症の影響を受けていて、平均よりも頭がいいのだが、社会的な人間関係をうまくこなすことができなかった。
This made Kenshi very sad and from then on he started to hate himself because of his very uncommon name (in Japan there aren't many people that have Yonezu as last name and no one, but Yonezu Kenshi, is called Kenshi or the spelling is similar, plus it sounds like a stage name as well) he thought he was strange and weird, an uncommon person who shouldn't have existed (in fact in Japan there is a very strong will to follow the mass, which means if the greater part of girls have bangs, then the girls without bangs will try to have them or if they remain what they are, they might be isolated because different from the rest of the population). But Kenshi to make us, his fans, satisfied, he decided to collaborate with many people in the 2017 like the animators for MHA, DAOKO and Suda Masaki.
このことがケンシをとても悲しくさせ、それ以来ケンシは自分の名前の珍しさ（日本では米津を名字に持つ人は少ないし、米津ケンシ以外はケンシと呼ばないし、スペルも似ていない、 存在しないはずの珍しい人（実際、日本では大衆に従おうとする意志が非常に強い。つまり、前髪のある女の子が多ければ、前髪のない女の子も前髪を作ろうとするし、前髪のないままだと、他の人とは違うという理由で孤立するかもしれない）。しかし、ケンシは私たちファンを満足させるために、MHAのアニメーターやDAOKO、菅田将暉など、2017年に活躍した多くの人々とのコラボレーションを決めた。
He changed during his musical career, like the time he was still Hachi (ハチ) and he felt somehow lost in all of his fame, so he made this song wearing heeled shoes and then the next song, Flamingo, is very different from Lemon because many people started to listen and to know him after Lemon, but he wanted to know what they would think if Kenshi changed the rhythm and the kind, turns out that many of them were attracted by Lemon and they didn't like Flamingo, but they still subbed to Kenshi's YouTube channel. Thank you for reading all of this, English isn't my mother language so I'm sorry for the mistakes and as always, have a nice day :D
彼は音楽活動の中で変わっていった。例えば、彼がまだハチだった頃、有名になることにどこか迷いを感じて、ヒールのある靴を履いてこの曲を作った、 というのも、多くの人がLemonの後にKenshiを聴き始め、知るようになったからだ。しかし、彼はKenshiがリズムや種類を変えたらどう思うかを知りたかった。英語は母国語ではないので、間違いがあってごめんなさい。
Edit: You can find a video summary of Yonezu Kenshi's life and all of his interviews, it's in Mandarin tho. I hope you have a good translator to understand what he's saying.
米津建志の人生とインタビューの要約ビデオを見ることができます。彼が何を言っているのか理解するために、良い翻訳者がいることを願う。