At first, Akira is thrilled to relive his childhood, free from the burdens and responsibilities of adulthood. However, he soon realizes that he retains his adult memories and knowledge, allowing him to navigate his childhood with a newfound perspective. With his adult wit and experience, Akira sets out to redo his childhood, making new friends, influencing events, and trying to create a better life for himself.
The turning point occurs when his childhood crush and sister figure, , invites him to her wedding. Forced to watch peers step into successful adulthood, Boku is overwhelmed by despair and a intense desire to rewrite his history. He suddenly loses consciousness and undergoes a psychological time-slip, waking up in his preteen body. Armed with his adult consciousness, Boku resolves to face his past antagonists and reclaim his life. Key Characters gaki ni modotte yarinahoshi!