Tatsuta Ootori
大鳥 辰太
Tentang
A second-year student at Kashinokidai High School. The head of the art club. As a background character in his class, he spends his days trying to stay as unnoticed as possible. Through being assigned cleaning duty together, he learns Luna's secret and becomes her practice partner for blood-sucking—essentially, her "Mama." (Source: Official site, translated)