In the present day, the local government of Katori City is in the process of sponsoring a taiga drama about its famous historical figure Tadataka Ino, who is known for being the first person to make a map of Japan in 1821. During the process of of making the drama series, a surprising fact is discovered about the first map. That fact is that Tadataka Ino was not the person who made the first Japanese map.

Kasumi doesn't know what love is and she doesn't have any feeling of romance. Due to her sister's marriage, her mother arranged a formal marriage arrangement without her permission. At the meeting, she met a man who is just seeking a friend.