Life keeps on changing for everyone, including all of the heroes of Delta. A school for aspiring heroes has opened and a new age of heroes is yet to come and an event taking place in Camena called the Strange Games has made every Strange One in the world excited. That is until Chara awakens from her comatose state after all those months of sleeping. Then suddenly, an assistant of a Strange One executive starts to mess with the head of one of Delta's new Youth Members. Without warning, the Strange Games is disrupted and the Dark Ones wreak havoc around Camena. But in the end, a sacrifice will be made... How will this affect everyone?

A month has passed since humans and Strange Ones were brought together, and ever since, the world has been peaceful. But things take a questionably expected turn when Alex's biological brother, Michael, who is shocked to see that the world has changed ever since the Strange Ones came around, comes home from his trip with his friends. After Alex and the others introduce him to the heroes of Delta, everyone's positivity crumbles when Ruby is suddenly injured by three mysterious girls they have never met. Now that a new dangerous situation is on the rise, the heroes of Delta will have to teach Michael the ways of Delta and stop this mysterious threat from destroying the peaceful life they have created for everyone, only with the help of the newest recruits of Delta and a weapon they had found in the Dark Ones' base.

Alex and her friends are going to Strange Island, home of the Strange Ones, to spend their summer for a vacation, and they hope that they will have a good time over there. As the days pass, Alex discovers something completely wrong on the island. Disappearances, attacks, and thievery is all over the island. Soon, the group of humans are saved by a group of Strange Ones that are part of Delta, an organization of highly-trained Strange Ones who are determined to save Strange Island from the reign of the Dark Ones, an alliance of Strange Ones that are full of anger and hate and the source of the three flaws on the island. Now that they are staying with Delta, the humans will have to make new friends and save Strange Island from danger and humanity from extinction.