よふかしのうた 1 [Yofukashi No Uta 1] by Kotoyama

A sleepless teenage boy begins roaming the city at night and encounters a mysterious, free-spirited vampire girl who introduces him to the pleasures and freedoms of nocturnal life while teasingly offering to make him like her. As they spend nights wandering, talking, and pushing each other’s boundaries, he confronts his loneliness and awkward longing, and she reveals glimpses of a more complicated inner life. The first volume blends melancholic coming-of-age themes with gentle humor, romantic tension, and a dreamlike nighttime atmosphere.