"5-Oku-Nen Button" is a science fiction manga series that explores themes of time, sacrifice, and the consequences of altering reality. The narrative centers on a mysterious device known as the "500 Million Year Button," which allows its user to fast-forward through time by pressing it. However, this power comes with a significant cost: while the user experiences the passage of time instantaneously, their physical body remains unchanged, and they lose all memories of the skipped period.

The protagonist, a young man named Shun, discovers the button and initially uses it to escape mundane or unpleasant moments in his life. As he becomes more reliant on the device, he begins to realize the profound implications of his actions. Each press of the button propels him forward in time, but it also isolates him from the people and experiences that define his existence. Over time, Shun grapples with the emotional toll of his choices, as he witnesses the world changing around him while he remains stagnant.

The story delves into the psychological and existential dilemmas faced by Shun as he navigates the consequences of his decisions. The button becomes a metaphor for the human desire to avoid hardship and the unintended repercussions of such avoidance. Supporting characters, including friends and family, highlight the impact of Shun's actions on his relationships, emphasizing the importance of living in the present and embracing life's challenges.

As the narrative progresses, Shun is forced to confront the ultimate question: whether the ability to skip time is a blessing or a curse. The series builds toward a poignant exploration of mortality, the passage of time, and the value of human connection. Through its thought-provoking premise and character-driven storytelling, "5-Oku-Nen Button" offers a compelling examination of the human condition and the choices that shape our lives.