Oraku leads a charmed life as a high school teacher with a promising future alongside his colleague, Satsuki, whom he dreams of marrying. However, his luck takes a complicated turn with the arrival of Aya, a student infatuated with him, sent to live with him by her crime boss father. To make matters worse, Aya's father demands her purity, threatening Oraku's life if she strays. Now, Oraku must navigate a perilous path, resisting temptation while safeguarding Aya from predatory eyes at school. The risk of scandal looms large, as any hint of impropriety could cost Oraku his career. Truly, luck has a double edge for Oraku.