Anime Sanjuushi

D'Artagnan travels from Gascogne to Paris with the goal of joining either the King's Musketeers or the Cardinal's Guards. Upon arrival, he gets into a conflict with Athos, Porthos, and Aramis, challenging them to a duel. The fight is halted by the Cardinal's Guards, who are enforcing a royal ban on dueling. As a result of the encounter, D'Artagnan and the three men form a bond and adopt the motto "all for one, and one for all."