The current promo should be another edition of the blossoming gacha promo that was available in December when I started out. My old comrade (Wutan) paid for it back then where he got Viola's alternate as the guaranteed 6*.
Any premium character (5*/6*) you get from the gacha is guaranteed to bloom, but beware, the pool is limited to those who got blossoming
from 21st November 2016 to 27th March 2017. You can verify this by clicking the contents button at the top and refer to this list:
http://flowerknight.wikia.com/wiki/Category:Bloomed.
If you're just looking for a new rainbow, even if random, it's good. Otherwise, just wait for a rainbow ticket promo. If you happen to own
every rainbow in the pool, you'll just get a random one.
Elixirs are the bonuses from this, not equipment flowers/"dresses." Like its prototype, you should get:
- x1 rainbow elixir [開花の秘薬(虹)]
- x2 gold elixir [開花の秘薬(金)]