“Life is like medicine—some flowers heal, some poison.” Sosei Haruki, heir to a 300-year-old medical dynasty, stopped aging at fifteen after a tragic accident. Now, he travels to Vietnam to uncover the truth behind his mother’s death. Alongside Mizuki, he confronts a hidden world of danger and injustice. With ancient medicine and martial arts, Haruki must choose: remain a victim of the past, or become the cure for others.