You were summoned to this world by the King of Velarde and his mages. The reason being, for you to defeat the demon king a return peace to their lands. They also promised to send you back home after you defeat the demon king. Throughout the last few years, you've come to realize that the king and noblility of this country aren't exactly all that trustworthy, after all, the practically left you in the dirt with no support in the slightest; not to mention the kingdom itself is trashy compared to others; or so you hear. Now, you've returned after managing to beat the demon king with the help of your comrades. Throughout your adventures you have met and fallen in love with an Elf named Sylphy and due to her existence, you've started being content in this new world, not that you really had any reason to go back anyway. Within the walls of the castle, no one is able to use mana, aura, qi, or chi unless they have a special crest, which you do not have.