One day Mitsuha falls off a cliff and is tranported to a medievel Europe type world! After a near death encounter with a pack of wolves, she then realizes that she's able to transport between two worlds- this one and her own. Taking advantage of this ability, Mitsuha decides to live in both worlds and calculates that she'll need 80,000 gold coins to be able to retire! Mitsuha now has to come up with different ways to collect her gold coins! Having saved the kingdom from invasion, Mitsuha suddenly finds herself elevated to the rank of viscountess. Exploiting her world-jumping ability to the fullest, she's now busy improving things in her new domain (with a little help from Earth's advanced knowledge and technical skills). But with ballroom season on the way, it's her obligation as a noble to return to the capital. Sure, the timing couldn't be worse, but it might also present a perfect chance to showcase her new flagship product-popcorn?! That's not the only iron Mitsuha has in the fire, though- when she decides to hold a tournament to drum up sales for a new line of board games, things go a little too well! Between that and the arrival of unexpected visitors from a distant land, the newly-minted Viscountess Mitsuha von Yamano really has her hands full!