I'd get the Manyu's, you're almost finished anyway with more than a week for the event to go, so there are still plenty tickets to come with plenty life crystals to farm along the way.
with extreme bad luck in reset 7 you can be a LONG time in reset 7 I'd say. I definitely would just plow through the event as fast as you can, you can probably get manyus by running secret garden at a better stamina rate.