Help? The theme song of Sekai-ichi Hatsukoi was also written by Chester Bennington , Mike Shinoda and a couple of other people too?

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I looked at every video that had this song playing and I was curious who was the lyricists and it turns out it’s these two and some other guys? But in some of the wikis I’ve look it said Wakaba. I’m confused. I’ve looked who were the composers and etc it said Wakaba but in YouTube it’s different. What is true and what is false?????