The Strongest Tamer Returned from Another World with his Childhood Friend as his Familiar

Synopsis

After being unexpectedly transported to another world and rescuing it from a looming disaster, high school students Wataru and Rumi return to their original world, only to find it drastically changed. Dungeons have emerged, and people have developed unique abilities, transforming their reality into something reminiscent of the world they left behind. In this new dungeon fantasy setting, Wataru, a skilled tamer, and Rumi, his familiar and childhood friend, navigate this altered world, facing challenges and uncovering mysteries as they confront the evolving threats together.