(Courtesy Film Movement)A scholarship student with a vulnerable immigration status (he’s Korean-Japanese), Kou has a lot more at stake than the carefree Yuta. One of my most cherished moviegoing memories is a Brattle Theatre matinee of “Linda Linda Linda,” which I’m horrified to be informed took place two decades ago. Support WBURA still from Nobuhiro Yamashita’s 2005 film “Linda Linda Linda.” (Courtesy GKIDS)It's a blessedly inconsequential story of four high school girls with three days to put together an act for their high school talent show. “Linda Linda Linda” accumulates ephemeral grace notes and wry asides before blowing the doors off with a euphoric climax of pure punk rock elation, one of the happiest endings I’ve ever seen in a movie. “Happyend” and “Linda Linda Linda” are playing at the Brattle Theatre from Friday, Oct. 3, through Wednesday, Oct. 8.