Akumade Kujaku no Hanashi desu.

High school teacher Kuji Yakurou is left heartbroken and dumped by his girlfriend, who dismisses him for a supposed "lack of masculinity." Struggling to understand why gender stereotypes still dictate modern relationships, he finds himself approached by Akano—a high-achieving model, influencer, and the president of the Biology Club—who asks him to become the club's faculty advisor. Shortly after, she begins lecturing him on why "masculinity" is biologically essential for attracting a mate, using the striking, flamboyant feathers of a peacock to prove her point through the lens of science.