The narrative centers on , a 14-year-old insomniac who becomes disillusioned with societal expectations and stops attending school. During a nightly walk, he meets Nazuna Nanakusa , an eccentric, flirtatious vampire who convinces him that people stay awake because they are dissatisfied with their day.

( Yofukashi no Uta ) is a supernatural romance-comedy series by Kotoyama. It is celebrated for its evocative, "vibey" atmosphere that captures the freedom and melancholy of late-night urban exploration. Story Premise

Ko decides he wants to become a vampire to escape his mundane life. However, the series introduces a specific rule for transformation: a human only turns into a vampire if they are bitten by a vampire they are . The plot follows Ko’s attempts to understand love—a concept he previously found incomprehensible—while spending his nights adventuring with Nazuna.