Chitose is a serious and responsible class committee member who secretly harbors a dangerous secret: she is a vampire. She lives under the watch of Santa, a trainee priest and her childhood friend, with whom she shares a long-standing and increasingly aware mutual affection. Their stable but tense coexistence is disrupted when another vampire named Jiruji arrives, assigned as a new monitoring target for Santa. Jiruji is bright, outgoing, and openly affectionate, quickly stirring feelings of jealousy in the reserved Chitose.

One day, after Jiruji bites Santa, Chitose decides to “overwrite” the bite by drinking his blood herself. To her shock, she discovers that blood already drunk by another vampire tastes far more delicious than ordinary blood. This awakening reveals a peculiar fetish within her: she craves blood that has been “taken” from someone else, a desire she comes to recognize as “chitorare.” This new obsession throws her emotions into turmoil, as her hunger, her budding love for Santa, and this strange sexual instinct begin to clash in unexpected ways.

As the story unfolds, Chitose finds herself torn between her growing feelings for Santa and her increasingly undeniable appetite for stolen blood. Matters are complicated further by the appearance of a human rival and a childhood friend who is a werewolf, each adding new layers to the dynamic. Santa’s pure and genuine affection stands in stark contrast to Chitose’s conflicted desires, forcing her to question whether what she feels is love or simply unfulfilled craving.

The narrative follows Chitose’s comedic and heartfelt struggles to balance her everyday life as a model student with the chaotic urges of a vampire who has discovered a deeply embarrassing fetish. Key developments include a seaside trip where the group’s swimsuit showdown and Santa’s sudden closeness with Jiruji push Chitose’s jealousy to a breaking point, eventually leading to the revelation of the true nature of “chitorare.” Through it all, Chitose must navigate a tangled web of love, lust, and hunger, all while trying to keep her secret identity—and her increasingly peculiar desires—under control.