One day, a young man met a woman hanging out in a park and lent her a magazine without checking her ID, but when she returned it, she informed him that a man had run away with her money. Realizing that she had no money, the young man took the loan of this book as a cue and told her that he was working on a business trip to do some reverse soap, and she carefreely told him about her background, saying that she had also worked as a prostitute. The young man wanted to see if her technique would work on a professional woman, so he gave her a reverse soap for free...

Nagisa Gumi Gold Batch Shirogane Maji (Tamotsu Ishibashi) has returned to his hometown of Nagisa after a successful stint in the Kazengumi. Just then, Maji receives word that his long-time enemies, the Shuyukai, are to leave the Kazagumi affiliate. The Nagisa territory, which is located in the neighbourhood next to the Shuyukai, is in a state of crisis. Maji's achievements in Kazagumi training earned him a big role as assistant to the Nagisa clan's young leader. However, the newly released Nagisa clan chairman, Isaburo Foragi, does not take kindly to this and interferes with Serious in any way... and the all-out war between the Shuyukai and the Nagisa clan begins!