Sonic: A lonely horizon

Everyone knows the story of Sonic the hedgehog, the adventurer faster than the speed of light, whose greatest power wasn't just his speed but the love and companion of his closest friends and allies and that love that the key of all his victories over the years and he tought that the feeling would never end, but his last adventure showed that even the closest of bonds will end eventually, something that hit him harder than any other punch he receive over his life.

Years later a now even lonier hedgehog is called once again to save the world from a new threat but a crucial element is needed and is the only thing that he tought he didn't need anymore...his friends.