Is it Wrong to slay Swallows in a Dungeon? (No story just an Idea)

There have been fanfics of Bell receiving training before going to Orario or that one fic where he is the reincarnation of KYN's Tanjiro Kamado, but what if in this timeline, Bell is enamored by the Tale of a Swordsman of the Far East named Sasaki Kojirou (The Fate version is what I'm going for) and decides to hone his skill with the blade like Kojirou before going to Orario to be a Hero/Adventurer.