[rkgk] Before and After
「ドッペルもどきが　其処いらに溢れた 　挙句の果ての今日 　ライラ　ライ　ライ」

From my X feed, I've been seeing a couple of fanarts of Narumi showing how he would have looked like back when he was still an army spy. I thought this song fits him when he became disillusioned and went on to quit and become a detective.