Nobunaka Ota is an ordinary unemployed unemployed student who has been involved in various events when he meets an unidentified samurai who has traveled back in time from the Sengoku period. One day, Shinchu met a man dressed as a samurai. But he says the man has amnesia and doesn't even remember his own name. Frustrated, Shinchu brings back the "Samurai", but that's how it all started... Full of mysteries and full of curiosity, the "Samurai" fell in love with the hamburger he ate and decided to work at the same hamburger shop as Shinchu! ? On the other hand, Shinchu, who wishes to live in peace and safety, gets busier every day as he is swayed by the "samurai". Friendships that grow over time. However, the key to regaining the memory of the "samurai" lies in an unexpected place--who is the he?