Mitsugu Bamba is a high school student distinguished by her ash-silver hair, golden amber eyes, and a turquoise earring adorning her left ear. She pairs her uniform with a light blue and navy jacket and brown shoes. Driven by an ardent obsession with blood donation, she seeks to save lives despite her rare Chimera blood type, which medical institutions deem unusable. Undeterred by harsh treatment from blood bank staff, she persists until encountering Mai Vlad Transylvania—a pale, foreign-looking vampire who collapses after destroying the facility. Mitsugu shelters Mai, discovering her need for blood without direct feeding, and launches a school blood donation club as its captain to sustain her.

Her devotion blossoms into romantic affection, marked by vows to win Mai’s heart and open declarations of commitment. Transparent internal monologues—sometimes unintentionally audible—reveal her unwavering dedication, even as she navigates slapstick mishaps and absurd adventures parodying kaiju films and gothic lore.

A hidden lineage ties her to the Helsing Clan, with her father Van Helsing embodying their vampire-hunting legacy. This heritage clashes with her protective loyalty toward Mai, fueling tension between duty and desire. Though episodic chaos escalates into surreal territory, Mitsugu consistently restores order by each chapter’s end. Her Chimera blood and Helsing roots hint at latent supernatural ties, yet the narrative foregrounds her role as Mai’s determined caretaker and earnest romantic pursuer within a comedic framework.