Having completed their diplomatic delegation, Mitsuha and the girls finally get to go home…but there's no time for our heroine to relax! In Japan, she becomes a small business owner and also opens her first store on Earth: an art gallery café. In the other world, the viscountess ventures solo to the enemy land across the sea, and even launches another shop! “I am Nanoha, crosser of dimensions in the name of a wandering god! I cast open a path to another world!” Using her world-jumping ability, Mitsuha becomes an explorer of the New World, a spy, a sculpture artist, and more! There's no stopping her now! Business is booming in volume 4!

The newly opened gallery café Gold Coin is a huge hit with the locals thanks to the savvy manager and waitress running it. Meanwhile, the café's owner Mitsuha is going on an undercover mission to the New World. Disguising herself as a foreign noble/royal, a sweet innocent fan of the navy, and even as the Envoy of the Goddess, Mitsuha gathers intel and spreads disinformation, sowing her seeds for future invasion. Joining forces with a young and ambitious local merchant, Mitsuha plots to tip Vanel's economy with Earth's spoils: sugar, spice, and other nice but useless foodstuff. Dodging pushy nobles, meeting the King of Vanel, and introducing a new business plan to Yamano County, the world-jumping heroine is on the fast track to becoming...the head of a secret evil economic empire?!

Joining forces with the ambitious merchant Lephilia, Mitsuha is on a roll in the New World. But now their inventory's been stolen by a jealous rival! She's not letting them get away, though. It's payback time-with the cunning use of her world-jumping ability, of course. In this volume, our heroine is cooking up even more storms: an exclusive club for young noble girls, a manmade island, and a new kind of weapon that'll knock a boy's socks off?! Sure, saving up gold coins for her retirement is important, but right now, Viscountess Mitsuha von Yamano is amped up to undermine her enemy and strengthen her own county's and kingdom's economic power like a full-fledged ruler!