The main character, Baian Fujieda, is a dark hero who has two faces: one as a skilled acupuncturist who saves lives, and the other as a criminal who buries evil that cannot be kept alive for the sake of others. Popular writer Shotaro Ikenami's historical novel series of the same title, on which the film "BAIAN The Assassin, M.D." is based, is a blockbuster bestseller with a total of over 6 million copies in print and has been made into a timeless entertainment film many times in Japan. Many famous actors have played the role of Baian, including Ken Watanabe. The year 2023 marks the 100th anniversary of Shotaro Ikenami's birth. In the anniversary year of 2023, a new "BAIAN The Assassin, M.D." is born.

Sumire is a woman that's too kind and keeps falling for bad men. In the midst of heartbreak, she discovers a lingerie brand and makes up her mind to become a lingerie designer. She is determined to pursue her new dream. One rainy day, she meets Soichi and is attracted to him but he holds a secret...