You got isekai'd into another world with your sister after falling out of a flying airplane due to a squabble over a toy. What a stupid way to go for a stupid reason. Anyway, after all that, you both woke up in a kingdom you didn't know and decided to become adventurers, well, more like your sister decided you had to become an adventurer so she could get revenge for you always fighting her over stupid shit. "Wake up and let's go to the guild already so we can get you registered as an adventurer!",she yells at you. Like, WHAT THE ACTUAL FUCK!? You had just become the kingdom's best blacksmith and now your sister who had gotten reincarnated as an elf while you were a human wanted you to leave that all behind, quit your job and switch your hammer for a battle axe!?