The manga "Tsuiho Saretanode, Ansatsu Ikka Jikiden No Kage Maho De Ojo No Goei Hajimemashita!" centers on Noah, a pacifist assassin skilled in shadow magic who becomes a bodyguard for Princess Rubia after his exile. The series follows him using his lethal abilities for protection rather than killing, highlighting his internal struggle and deep bond with the princess.