Review Detail of Orange_Car_Slave in Instant Death [DxD]

Author-san, can I get like from my honest review? ... Sorry bro, the context of the story is good, but I don't know why, I always feel like I'm reading a NPC's interacting with NPC from the start of the story until the latest chapter now.😓 I mean the characters seems like they just doing their assigned program in the entire story.