Kumazawa is a male student at Shinonome Academy, a school with a predominantly female student body resulting from a global pandemic that induced widespread erectile dysfunction in men. He shares this condition with the majority of the male population. To address his impotence, he actively maintains a regimen of physical exercise and careful diet. His demeanor is friendly and approachable. He initiates casual conversations with Itsuki Sonomiya, the transfer student unaffected by the pandemic, establishing himself as a peer within the school environment. Throughout the narrative, Kumazawa maintains consistent personal circumstances and methods for managing his condition.