Ch. 1-2,6: Yano is dependent on Michiya and when a woman shows interest in Yano, Michiya becomes territorial
Ch. 3-4: Hakamada is reunited with Naruko, a coworker he took advantage of 10 years ago, when he is promoted, but now Naruko's his boss
Ch. 5: Minato is discovered by his father's business partner Machida working at a drag bar because he needs money and Machida begins paying him to hook up
Yandere Hitotsu Yane no Shita