The first song I heard was Tookutemo feat.WISE
I follow Satoh Ayumu's blog (the male model in the video) and so that's how I first heard of her
And then in the following video, Kimi ni Aitakunaru kara, he was in it again haha.
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"Remember, don't let others dictate your music taste. If you like whatever you're listening to, keep listening to it."