Boy's Abyss, Volume 5 (Boy's Abyss #38-47)

Now that Ms. Shiba and Chako have each found out about the other's relationship with Reiji, things get ugly. While Chako's parents tighten their stranglehold on her, Reiji's mother, Yuko, secretly meets with Gen and Esemori. And then, Ms. Shiba makes Yuko a reprehensible offer...