Ritsuka Uenoyama is bored with it all—with school, with his basketball club, and even with his one true passion: playing guitar. That is, until the day he finds his favorite hidden napping spot occupied by a strange boy cradling a broken-stringed guitar. At first, Uenoyama is nonplussed by Mafuyu Satō and his slightly odd behavior, but when, on a whim, he asks Mafuyu to sing, the power of that song pierces him to the core.

"Nobu" is a bar located on a not so busy street in Kyoto. The front entrance of the bar is connected to the alternate world of "Aiteria,” which is like medieval Europe. People from Aiteria visit the bar Nobu.

Nobuyuki Yazawa was once a chef at a high-end restaurant, but he is now the owner of Nobu. Shinobu Senke works as a waitress for the bar. She is bright, smart and pretty. The bar's cold beer "Toriaezu Nama" becomes popular and the bar thrives. Customers from Aiteria with various backgrounds like soldiers, merchants, and noblemen have a good time at Nobu.