There are some solid reviews on the movie so I'll just add a few thoughts.

Overall: this got better and better as it went on with an ending that was extremely well done. In the beginning, I really struggled with the homophobic, self centered, jerk protagonist. But he actually has character growth which was great. I need a sequel to this movie. Somehow he gets reincarnated as an adult and they solve another mystery together (and also showing explicit romantic feelings would be a bonus)

BL? Bromance? I think they definitely loved each other, whether that was platonically or romantically is not clearly defined, I think it can be a bit up to the viewer's interpretation.

Content Warnings: death, grief, manipulation, violence, held against will