Satoru Fujinuma is a struggling manga artist who has the ability to turn back time and prevent deaths. When his mother is killed he turns back time to solve the mystery, but ends up back in elementary school, just before the disappearance of his classmate Kayo.

The drama tells the story of the young technician, Chang Hanqing, and the fighting hero, Jin Xing, after the founding of the People's Republic of China . It is the story of the R&D, innovation, and development of the new Chinese electric locomotive.

This "sibling romantic comedy" revolves around Masamune Izumi, a light novel author in high school. Masamune's little sister is Sagiri, a shut-in girl who hasn't left her room for an entire year. She even forces her brother to make and bring her meals when she stomps the floor. Masamune wants his sister to leave her room, because the two of them are each other's only family. Masamune's novel illustrator, pen name "Eromanga," draws extremely perverted drawings, and is very reliable. Masamune had never met his illustrator, and figured he was just a disgusting, perverted otaku. However, the truth is revealed… that his "Eromanga-sensei" is his own younger sister! To add to the chaos that erupts between the siblings, a beautiful, female, best-selling shoujo manga creator becomes their rival!

Former tennis pro Lee Goon had his career cut short by a devastating injury, plunging him into despair. Desperate for relief, he turns to a psychiatric tool called the "memory eraser," which allows him to reset his life and regain his confidence. However, the tool plants false memories in Goon's mind, making him believe that his psychiatrist, Kyung Joo Yeon, is his first love. Will meddling with memories lead Goon and Joo Yeon into further trouble, or will it inadvertently spark a lasting romance?