Being absolutely emotionally distraught with how REAPER AND ANGEL track is first used in the scene where they come together in the train and then later on when they break apart in Blackpool.
In the first scene, you see Sugiki first decided to chase after Suzuki. While in the second, Sugiki was breaking it to Suzuki that they could not be together.
When Sugiki found Suzuki in the train and tell him no and he'd stop, at the same time, Sugiki left, closed the door and left Suzuki alone.
In the train while they were kissing and dancing, not being able to be apart for too long, the morning after in the hotel room, Suzuki was left alone with only the pieces of his broken heart at his feet.
At the end, Sugiki and Suzuki were together in the train, while in the hotel room, Suzuki was only accompanied by his own reflection.
It's the Reaper who decided to find the Angel first, but it's also the Reaper who left the Angel alone.
Play these two scenes at the same time and you will see that aside from the couple of seconds difference in the middle, each shot in one scene tells you the opposite of what's happening in the other. Just like the title of the track, REAPER and ANGEL, two opposing entities.
The use of this track for both scene is absolutely a genius move and I would like to kiss the music director or whoever decided to score the scenes this way right on the mouth.