If you loved 12 Suicidal Teens, try Keizoku: Unsolved Mysteries - Beautiful Dreamer
A bridge between a film you've already seen and one most people haven't. Keizoku: Unsolved Mysteries - Beautiful Dreamer has roughly 4.8× fewer votes than 12 Suicidal Teens — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Yukihiko Tsutsumi, and they both carry the slow burn mood tag, and they sit in Drama / Mystery territory. If that's the register that drew you to 12 Suicidal Teens, the second film will land in a comparable space — through a different lens.
What Keizoku: Unsolved Mysteries - Beautiful Dreamer is
Susono Station, late autumn, the 7:13 to Tokyo humming past. A detective hand-me-down is reassigned to unsolvable files; her partner’s cigarette ash piles higher each day. Sharp heels click against linoleum, startling a precinct used to slouching. One arrests eye contact and won’t let go. A polished instrument finds its worn-out orchestra.

