Always reliable and kind-hearted, Kiyoko Yoshida is named the president of Class 2-1. On the first day of school, a boy named Yano Tsuyoshi arrives late, covered in injuries. Due to her caring nature, in addition to Yano being seated right next to her, Kiyoko cannot help but worry about him and how he got those injuries to begin with. After cautiously following him home one day, she learns the truth—he is just extremely clumsy. Kiyoko soon finds herself constantly worrying about Yano, both at school and at home, not realizing that she is falling in love with him. Armed with a first aid kit, Kiyoko makes it her mission to care for Yano's mishap-related injuries as a romance between the two begins to blossom.

Since ancient times, the ninja and the yakuza have been at war, spilling blood around the world as empires rise and fall. So when, in the modern age, Shinoha, a ninja, meets Kiwami, a gangster following the path of the yakuza—the gokudo—and discovers they have common interests, the obvious assumption is that nothing good can come of it. But can it be that one burgeoning bromance will shake up a 300-year grudge? Who will win the struggle for real ultimate power?

Lunia, the daughter of the Count of Persephone, was shunned by her father and treated like a tool by her half-brother, leading a lonely life. Meanwhile, she is chosen by a priest to be engaged to Hades, the head of the Duke of Khronoa family, and decides to marry into the cursed duke family. The Duke of Khronoa, feared as the "King of the Underworld," is cursed with a short lifespan if he does not marry a bride chosen by the emperor. However, Hades tells Lunia that he has no intention of loving her. In order to keep Hades alive, Lunia deceived him and spent the night with him, then disappeared without realizing that she was pregnant with his child. Seven years later, Hades somehow managed to find Lunia and tried to take her back with the child...

Insults aimed at Saku Chitose are a dime a dozen. Nicknamed "Class 5's womanizing scumbag," he is constantly slandered online by those jealous of his popularity. Luckily, that barely makes a dent in Saku's confidence. Outside niche internet forums, he is the reputable figure his schoolmates admire and a model student his teachers trust. As his second year of high school commences, Saku reunites with his old friends and befriends new ones, all belonging to the school's social elite. However, the fun is cut short when Saku's homeroom teacher instructs him to convince his shut-in classmate, Kenta Yamazaki, to return to school. Wishing to wrap things up quickly, Saku visits Kenta's house the very next day. But the task proves more challenging than he expected when he discovers that Kenta is firmly and fully on the Saku hate train. If he wants to preserve his impeccable image, Saku must find a way to win over Kenta and bring him back to school.