Interviewer:
What does "Never Knows Best" mean?
*giggling* The English written on her cigarette

Tsurumaki Kazuya:
Oh, that? Originally, it was a cigarette on a postcard I have.
What did it say on the cigarette?
It was a close-up picture of a cigarette that had "Join London" on it.
And it was probably handwritten, not printed.
I thought it looked cool and that I would mimic it.
*with laughter* It's not a cigarette brand. There's no such brand in Japan

Interviewer:
I thought that it might be the title of a song.

Tsurumaki Kazuya:
Oh, no.
I'm not sure if it has a real meaning or not.
How can I say it? Um...
*in an explanatory manner* There's a best way, and not everyone can follow it.
No one knows the best way.
I thought it reflected Mamimi's belief that there's no future.
That it had a nuance that said she's given up on life.