In the chapters leading up to and including Chapter 18, the story focuses on confrontation with his former bully, Iinuma .

: Rokudou eventually asks Ranna to intervene when he can no longer fight back. This arc is a significant turning point where Iinuma begins to respect Rokudou’s tenacity, eventually leading to their friendship. Series Features

The manga series (also known as Rokudo's Bad Girls ) concluded its original run in April 2021. Since the manga is finished, "Chapter 18" is part of the early "Iinuma Arc". Chapter 18 Plot Overview

: After Rokudou's mysterious mark inadvertently causes Iinuma's girlfriend, Tsubaki, to fall for him, Iinuma challenges Rokudou to a fight.

: Despite being physically weaker, Rokudou refuses to run away and endures a severe beating.