"Once you were young, you have a whole heart to give." Bee, Tum, Tim and Nui have been friends. They experience an event that is a major change of their lives and shakes up their relationship when "Dang", a boy of the same age steps in. The break, though bring about sadness, they all learn about the true meaning of friendship and discover the true friends would stay with you... forever. Those friends are "Girl's Friends".