Both anime have a dark undertone with both Male Main Characters in each series that use supernatural powers with deadly intelligence and a decided lack of conscience as both characters have killed without remorse, Both series resolves around the main characters and their pasts whilst they go on missions with others assigned to them by an authoritative figure (in DTB MMC Hei is assigned to a team by a mysterious organisation as a contractor/assassin and in KNS, MMC Kazuma is assigned missions by his grandfather and is teamed up with his love interest/younger cousin and his brother), KNS is a bit more romantic then DTB and so is a bit softer but each MMC lost a female loved one which gives them both a trauma that they need to overcome and whilst DTB is more about crimes committed by other people and KNS is more supernatural, they both deal with the guys in each series wanting to do the right thing/justice due to the influences of the other characters as each series develops and this makes the viewer want to see them triumph over adversity, which gives a very similar feeling when watching one or the other.

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