I think I spotted the problem. You don't evolve with Manyus, you evolve with Bloom Dragons. Each color is available to farm one day per week in the special campaign section. Tachibana requires three lvl 100 and two lvl 20 Purple Bloom Dragons to evolve. Unfortunately for you, Friday is Purple Bloom Dragon day and we're now on Saturday's special campaign so if you did truly mean that you had manyus instead of dragons you'll have to wait for another week to farm the dragons you need.

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Is there a daily limit for the Lv. 100 Bloom dragons? I can't get the third one if my life depended on it (on the same day)