The mysteries of puberty and the bittersweet fumblings of first love are given a quiet, nuanced spin in "School Trip." Incisively structured and deliberately downbeat, this first feature by director Henner Winckler refuses to conform to contempo youth storytelling techniques. Some two dozen Berlin teenagers are on their mandatory school-sponsored outing - in this case, a bus trip to the Baltic coast of Poland. Cigarettes and alcohol abound, as well as general horseplay. The story begins to focus on the popular Isa (Sophie Kempe) and loner Ronny (Steven Sperling) who begins, ever so slowly, to circle in on Isa. Rather than brassy teenagers imbued with the glib attributes of adulthood found in most Hollywood films, Steven, Isa and their classmates are at once amusingly awkward yet heartbreakingly sincere. Eddie Cockrell