This is only speculation based on reports of fans who allegedly spoken to yui or her manager back when FLOWER FLOWER was still a secret. AGAIN THIS IS COMPLETELY OFF THE RECORD.
Around april 2012, she started playing secretly at live houses with other musician friends under the name of HANA. First live reported was on 2012.04.30 at shimokitazawa LOFT.
2012.08.30 Futakotamagawa KIWA
This live was determinant in many ways. It' was the first live FLOWER FLOWER performed as a band. (Jun from YL was there that day)
- Neither BOSS or Fukuda (or anyone else from stardust for that matter) knew about YUI's plans until this day. (That means she played in complete secret from her staff at least 15 times)
Fukuda started working with "yui" from this day.
- That day, BOSS was also there. A fan reported he had a really bad tempered face, leaving from the dressing room.
(Apparently, YUI wanted to show BOSS the type of music she really wanted to make, so she prepared this for several months and eventually she told BOSS, but he didn't agree.
Another theory is that YUI did this specifically to tell BOSS she wanted to quit. After all, the song "coffee" is almost literally telling BOSS he's a madman and she wants him to disappear)
2012.11.12 at shimokita loft again, a fan heard a conversation between Ruka Ibuki, another singer, and YUI's manager, Fukuchan, after the live:
- YUI was performing as FLOWER FLOWER with the resolution of resign Sony.
(At that time her manager had no idea the rumor was already floating around 2ch and some fans were treating YUI very badly, calling her traitor and whatnot.)
- On a meeting with Sony and Stardust, YUI really didn