Synopsis: Transmigrated into Doraemon's world, becoming Nobita's classmate Hoshino Uda, and activating a god-level sign-in system! [Sign in the four-dimensional pocket to obtain a level one small world!] [Sign in the magic world to awaken all-elemental magic talent!] [Sign in the time tunnel to obtain first-tier time and space abilities!] Sign in to become stronger, and roam freely in the adventure world! (Real-world mutation + grand adventure)