Ok K.O. Let's be heroes: Turbo Devil Requiem

5 years after K.O accepted T.K.O as him and became one with him and everyone got their own happy endings. Now at the age of 16, K.O is now a high school student and still an employee at Gar's Bodega, and is officially in a relationship with his childhood friend, Dendy. Upon hearing the news about a mysterious event that takes place in the forest behind the plaza, K.O, along with Rad, Enid, Mr. Gar, Carol, and Dendy, went to the event and they discovered it's secret and everyone in the event has become monsters known as demons and the plaza heroes expect for K.O and Dendy have become demons with turbonic energy causing them to become demonic turbo versions of themselves, and K.O has melded with the demon champion, Amon, only for him to take full control of the demon and become Turbo Devil. Now with the powers of a demon and his powers combined, K.O must use his new powers to protect the city of Lakewood, while he has to discover a way to free his friends from the demons that have possessed them.