Since this one came out straight from the author's studio, it's closer to what the author wants to convey, still a bit OOC though. Not a shipper of this duo but this movie is probably better the previous one, vfx and acting wise. The movie also expressed the bromance better than the novel, mainly because of the OOC parts on each character, maybe the staff have to change it to get the results they want.

For the ending teaser on "Flower Night" you can go read the novel and be surprised how Black Glasses is even colder and more ruthless. It doesn't have as much bromance because more than half of it was Black Glasses's solo mission but the story is very good.