"Nagasaki Keisuke, a main character in the Japanese manga ""Excuse Me, But The World Will Be Gone For A While,"" is a complex and multi-layered individual who plays a pivotal role in the series.

Keisuke is initially introduced as a shy and introverted high school student who struggles to communicate with others, particularly his crush and classmate, Kanae. However, as the story progresses, it becomes clear that Keisuke's reserved demeanor masks a deep intelligence and a fierce determination to protect those he cares about.

Keisuke's character arc is tied closely to the central conflict of the story - the impending end of the world. As the situation grows increasingly dire, Keisuke finds himself thrust into a leadership role, utilizing his knowledge of science and technology to help with the survival efforts. Keisuke's prowess in these areas is made all the more impressive by the fact that he suffers from a debilitating illness that often leaves him bedridden.

Beyond his technical expertise, Keisuke's greatest strength lies in his compassion and empathy. He forms deep bonds with the other characters in the series, particularly Kanae and the eccentric inventor, Sakurai. Keisuke's commitment to these relationships is tested as the stakes grow higher and the situation more hopeless, but he always remains fiercely loyal to those he cares about.

While Keisuke's character is primarily defined by his relationships with others, he also undergoes significant introspection and growth over the course of the series. As he confronts the end of the world and his own mortality, Keisuke grapples with profound philosophical questions about the nature of life and the meaning of existence. Through it all, Keisuke remains a compelling and dynamic presence, marked by his intelligence, courage, and unwavering sense of compassion."