Yuuto Matsubara is a 27-year-old man who works in the sales department of a major toy maker, but he isn't able to pursue his dreams, and he feels hollow every day. He's even given up on love with his childhood sweetheart Ai. One day a "Time Driver" robot that runs on the power of dreams appears in front of him, and he is forced into the cockpit against his will. Inside is a 12-year-old version of himself.

大手おもちゃメーカー営業部に所属しながらも、なかなか自分の夢を追いかけきれないままに、へこみ気味な日々を送り続ける松原勇斗27歳。幼なじみの恋人アイにも愛想をつかされがちな、そんなある日、かつて彼が子どもの頃に思い描いていた、夢の力をエネルギーに動くロボット“タイムドライバー”が突然目の前に現れ、無理やりコックピットに乗せられてしまう。しかもそこには、何と12歳のころの自分＝ちび勇斗がいた!?