Rocket & Retsuko: A Bro & Sis Story

After the Guardians of The Galaxy saved the Galaxy again, Rocket Raccoon starts to judge Star-Lord's love for Gamora caliming it's wrong for "Diffrent interspecies to procreate one another." This lead to Quill thinking about bringing in Rocket Raccoon's long lost sister Retsuko to come aboard over that question.

But little did he know that this lead to his envy for Retsuko as she spends more time than he does with Rocket. Until one day this lead to a fatal misunderstanding when Quill decided to start having revenge on her after Gamora accuses her of manipulating them like Ego did when he claimed to Quill that he was his father. By stepping on her foot on purpose in public, Retsuko forcefully brought out her inner demon to Xandar.

Quill later regrets that revenge idea as Rocket and Retsuko are now on the run after the Guardians, the people of Xandar, and Nova Corps saw her as the "She-Monster" and that she must be executed at all cost before they believe she could harm the entire galaxy. It's up to the siblings to prove to them that Retsuko is innocent and that Death Metal is a common thing in her home planet and that is is her "Nature" to do so as part of her stress reliever.