Mark Schilling Japan CorrespondentFollowing his win of the Silver Bear Grand Jury Prize at the recently concluded Berlin Film Festival for “Wheel of Fortune and Fantasy,” 42-year-old Hamaguchi Ryusuke suddenly finds himself catapulted to the directorial front ranks in his native Japan.It’s not that he’s exactly obscure there: Hamaguchi’s 2018 romantic drama “Asako I & II” was selected for the Cannes competition while his 2015 breakthrough, the five-hour-plus drama “Happy Hour,” won a group best