User blog comment:Meta07/Rating the difficulty (to sing) on a few Love Live songs/@comment-11148831-20141121114721

Wow. I could agree with this. Haha. (I'm not a singer, btw.)

One thing, though. Cutie Panther's lyric for that part is "Doko ni iru no?". :)

I believe Natsu, Owaranai de. is also hard. For me though. XP

You should try Datte Datte Aa Mujou and Ruteshi Kisuki Shiteru. They're pretty good songs too. :)