Tsuihou Sareta node, Ansatsu Ikka Jikiden no Kage Mahou de Oujo no Goei Hajimemashita! Demo Ansatsusha nanoni Hito wa Koroshitaku Arimasen

Overview

"With an assassin like Noah here, rumors may be spread that are unfavorable to the party." Noah is suddenly expelled from the hero's party. Having grown up in a lonely and difficult environment of daily training, Noah thought that his fellow heroes were finally friends he could trust... Just as Noah is at a loss, his childhood friend, Princess Rubia, appears before him. "Would you like to be my bodyguard?" Rubia recommends Noah as her bodyguard, but the king presents her with one condition: that he must defeat Tony Brown, one of the twelve knights said to be the strongest in the world, in a mock battle. Will Noah really be able to become Rubia's bodyguard? (Source: Futabasha, translated)

Source: AniList