You belongs to a vampire group with Bi, Ke, and Emu. Their boats sink during a journey, stranding them on an isolated island. Marie and her younger sibling Izu, who live on the island under the guardianship of housekeeper and guard Reza, rescue them. At the island mansion, You maintains a cautious and distrustful stance toward Marie and Izu. This skepticism deepens when Emu deduces Izu is also a vampire. You's distrust sparks internal conflict within the vampire group over their approach to the hosts. You aligns with Emu in advocating caution and opposing trust in Marie and Izu, directly conflicting with Bi and Ke’s willingness to trust the siblings. This internal disagreement unfolds amid external manipulation by antagonists Shilia and Harisu, who exploit Izu’s desperation to save Marie’s life.