The Genius Weakest Monster User Wants to Return I was Separated from My Strongest Attendant and Flew to a Strange Land

Fill Garden was a monster tamer who tried to take on the Demon Lord, but failed and was seperated from his maid waifu slave upon his defeat. He found himself transported to an unfamiliar city and promptly made a slave contract with a new cute girl and started taking low level quests at the adventurer's guild.