I believe this is the first manga by far to perfectly incorporate cut-throat Hit Man mechanics with the common Japanese Idol journey. You got a japanese John Wick who has decided to leave the blood stained world of Hit Men to pursue an innocent life. Naturally with a twist, to support his favorite Idol who functioned as the light source in his prior life covered in darkness and blood. It's worth reading to keep up with as an original story which barely relies on tropes. Lots of room for a long term story with each chapter epic enough to not feel tiring or boring.