Sonic and his friends find themselves grappling with the challenges of adulthood.
With Dr. Eggman's threats diminishing, Sonic searches for a new purpose amidst the burden of always being the world's saviour.
Tails, now Dr. Prower, gains commodity as a community doctor, all while delving into life creation experiments, aiding Knuckles and Rouge in conceiving the first ever interspecies mobian.
Shadow, in his quest to further explore his purpose as The Ultimate Lifeform, seeks Tail's assistance in harnessing his DNA, to cure all disease, starting with NIDS.
Amy, feeling the pressure of time, ends her relationship with Sonic, despite their mutual feelings for one another, as he's simply not ready to settle down and commit.
Following Rouge's suggestion, Amy turns to Tails for help with her fertility concerns, however, an unexpected incident alters her plans, leading to the emergence of a groundbreaking discovery.
This is The New Wave Ultimate Lifeform.
After Eggman wiped her memories and reprogrammed her into a ruthless weapon, Amy Rose became Crimson Rose, a deadly enforcer loyal only to the mad doctor.
Her once-heroic heart now beats with a singular purpose: destroy Sonic and his friends. But everything changes when she crosses paths with the brooding enigmatic Shadow the Hedgehog - the lone wolf of Mobius.
As they clash in battle, something stirs deep within her, a flicker of the past, a spark of humanity. Shadow's cold, silent strength challenges the dark programming in her mind, and over time, his unwavering conviction helps her rediscover the hedgehog she used to be.
Torn between the mission she was forced to follow and the person she is becoming, Rose must decide whether to stay loyal to the villain who created her or trust in the love and redemption that Shadow offers.
Can she overcome the darkness inside her solely by her love for the ebony hedgehog, or will Eggman's control destroy her forever?