When a younger brother (pseudonym) who has a special liking for hot weapons meets his elder brother (pseudonym) who has practiced swordsmanship since childhood, what kind of sparks will the two create? One-on-one, the younger brother who looks cool but is loyal at heart x the older brother who looks cold but is cool inside. The boss is the real brother~yo~. The background of the story is set in the end of the world, Qingshuiwen... Maybe.