Fudoutoku na Yami

After school, high school student Meguru Shina is assaulted in a train station bathroom by Sasakawa, his math teacher. Sasakawa typically presents a composed, professional image but is driven by a desire to obtain what he wants regardless of consequences. Shina, longing for affection yet unable to admit his vulnerability, becomes entangled with Sasakawa due to his flattering words and persuasive methods. Shina struggles with his growing attraction, while Sasakawa experiences intense jealousy. Their relationship spirals into a destructive and obsessive bond.