Masaki Suda in Cloud . Photo: Janus Films/Everett Collection Kiyoshi Kurosawa’s disquieting new thriller, Cloud , opens in medias res, the way classical epics used to. But this time we’re not watching a heroic soldier in the midst of battle, or a vengeful prince contemplating a king’s murder. Instead, Kurosawa throws us into the middle of a minor sales negotiation with very little context: Ryosuke Yoshii (Masaki Suda) is trying to convince a manufacturer of a somewhat mysterious “therapy device”