Childhood friendship can be a time of innocence, enchantment and perpetual excitement as portrayed in Sophia Silver's modest yet assured debut feature, Over/Under. But the mutual intoxication of the two girls whose intense bond is tracked from age 9 through 13 falters when they slip out of sync in their hunger for adult experience. Graced by lovely, natural performances from its young leads and the warming light of the New England summers during which most of its key developments unfold, this is a gently stirring coming-of-age drama observed with the unmistakable pangs of memory.