Tachibana Hinata and Jinguuji Tsukasa have been best friends since childhood. Now, at 32 years old, they're both average businessmen. One night after a mixer, an entity calling itself a goddess sends them to another world. When Jinguuji opens his eyes, he sees Tachibana, who's been transformed into a beautiful, blue-eyed, blonde girl. Now that the two are of different genders from each other, they're each bewildered by the other's charms. They steel their determination to defeat the Demon Lord in order to return to who they were with their relationship still intact.

Continuing on their adventure, Tachibana and Jinguuji arrive in a large town with a market and rows of buildings. But Tachibana's "Unparalleled Beauty" Charms men, one after another, leading Jinguuji to resort to purchasing a certain item.

At the same time, a dark swordsman reacts to seeing Jinguuji's wearing a suit, and challenges Jinguuji to a fight. Then Tachibana and Jinguuji learn that the swordsman is actually their fellow countryman...?!

Guided by Mouria of Ishurna's Intelligence Department, Tachibana and Jinguuji are granted an audience with the king. Thanks to Tachibana's Charm, the two gain the king's support. Then, Tachibana and Jinguuji end up having a falling out in the middle of a banquet. After ducking out of the hall, Tachibana meets a beautiful young woman who meets his every ideal, but the encounter gets him wrapped up in a huge uproar.