Let's walk and talk. Can you get up? The Gnosia lie. Pretending to be human, they'll get in close, trick and deceive, and then eradicate each person in the vicinity from the universe, one victim at a time. The crew of a drifting spaceship, facing off against a mysterious and deadly threat known as the "Gnosia" and having no idea who among them is really the enemy, formulate a desperate plan for survival. The most suspicious among them will be put into "cold sleep" one by one, in an effort to completely rid the ship of Gnosia. However, it is almost impossible to tell whether each person put into cold sleep was really Gnosia—or simply a poor, unfortunate scapegoat, sacrificed by the Gnosia for their own survival. Can the humans emerge victorious? Or is mankind doomed...?

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.

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.

Like any proper noble lady, one must have certain acquired tastes. For Melphiera Marchalrayd, she just happens to crave a rather exotic protein—monsters! But do not judge! Despite its bad reputation, monster meat can be used in exquisite cuisine and Melphiera is determined to change the kingdom's opinion of it! Unfortunately, since debuting in society, Melphiera has been struggling to find her perfect match...until she meets the fearless "Blood-Mad Duke" of Galbraith!