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there is no green heart event.
Her blue heart event happens when you walk into Dr.Hardy's house on a rainy day from 6:00a.m. - 12:00p.m.
Reach the bottom of the Third Mine. Then activate the Hammer Event with Carter again.
On 6th of Spring
Celia, Nami, and Muffy.
There are NO green heart events for any of the girls not even the special girls, so don't worry.
Go to Vesta's house between 6am and 8am, or 9pm and 12am.
Originally, the colour is black. And the second colour is either blue or purple, i forgot, hehe -_-" >.< bx
Each Heart Event has different requirements to activate. You have to be in the right place at the right time. And have a certain Heart Color or higher with the guy.
TO marry Celia you must have at least 60,000 LP (red heart)
ALL 101
There is no Black Heart Event. Only Purple, Blue, Yellow, and Orange.