One sleepless night, Ko slips out to walk the streets. Life after dark is a revelation! When flirtatious Nazuna invites Ko to spend the night at her place in an abandoned building, he’s stoked! But then he awakens to kisses on his neck with a little too much bite to them... Is it just the delicious taste of his blood that makes her meet him night after night for late-night adventures, conversation and...naps? Or something else? Then, when a cute girl from Ko’s past shows up and competes for his attention, his budding relationship with the undead is put to the test! -- VIZ Media

Kyoko launches her ambitious master plan to rid the world of vampires. How can Ko and Nazuna stop her? Then, when Ko gets injured, it leads to questions about the state of his humanity. Afterward, some relationships get mended while others are broken. Plus, a new haircut! -- VIZ Media

When Nazuna and the gang track down the secrets of her past, every answer only leads to another question. Who turned whom, exactly? What chain of events and relationships made Nazuna into the—uh—person she is today? Midori, on the other hand, would rather her human existence remain buried. But then she meets one of her “offspring” with a mysterious secret... Meanwhile, detective Anko pursues her vendetta against all vampire kind, invading their private lives and spaces! -- VIZ Media

The tragedy of vampire hunter Anko’s past and her former relationship with Nazuna is finally revealed. But old ties don’t always lead to new ones... Then, on Halloween, while Ko suffers through a date with Rila, Anko goes on a rampage—and our gang of vampire frenemies isn’t her only target! -- VIZ Media

Volume 15 contains fourteen of Black Jack's many worldly adventures... A Life to Live: Black Jack is called in to treat a young flower arrangement master. The talented artisan is suffering from acute porphyria which is impacting her digestive and nervous system. Given her current condition she cannot even stand to be in sunlight; as it often induces fainting spells, hallucinations and seizures. For an artist who focuses on light and life, to not be able to use sunlight to bring life to her art the ikebana master almost believes she has no life to lead. However with every new piece that she creates there is no doubt to her mentors that life itself is worth living. And if she survives she might have a life-changing decision to make about her career. A Star is Born: In a rare chapter where Black Jack does not perform an operation, the good doctor must treat a previous patient's heart and soul. Award-winning actress Igusa Suginami says she owes all her success to the treatment she received from BJ years ago. Since she had her operation she feels she has been blessed by a god of luck and is now ready to embark on the biggest performance of her life...She wants to confess her feelings to Dr. Black Jack. Sadly the doctor does not recognize Igusa the superstar. He says he treated Chika the young singing talent with ambitions of making it big with her skills. Their reunion does not appear to be destined as the next big romance; instead it might end up becoming a tragedy for the ages.

A visit to the night school Nazuna attended years ago yields new insights into her forgotten past. Niko, her former vampire instructor, reminds Nazuna about her first friend, Kyoko. To aid in the investigation, Ko must pretend to return the affections of a boy-crazy student. Then, as more clues are discovered, a tale of friendship, betrayal, and murder unfolds... -- VIZ Media

In a world where cursed spirits feed on unsuspecting humans, fragments of the legendary and feared demon Ryomen Sukuna were lost and scattered about. Should any demon consume Sukuna’s body parts, the power they gain could destroy the world as we know it. Fortunately, there exists a mysterious school of jujutsu sorcerers who exist to protect the precarious existence of the living from the supernatural! -- VIZ Media