It's been awhile since the war ended, and everyone is still working on cleaning up the mess Infinite and Eggman left behind. While everyone has some scars (physical and emotional) to heal from, Tails has gotten it the worse, having thought for the last 6 months that his big brother died and blames himself for being a complete coward. Hopefully, Sonic will be able to put those fears and other negative thoughts out of his little brother's head and assure him otherwise.