よふかしのうた 2 [Yofukashi No Uta 2] by Kotoyama

The second volume deepens the protagonist’s nocturnal odyssey as his bond with a mysterious, free-spirited vampire grows; he learns more about vampire customs and risks, wrestles with his desire to become one, and encounters new people and emotional complications that blur the line between companionship and obsession, all while the story continues to explore themes of adolescence, loneliness, and the intoxicating freedom of the night.