After wishing becoming the next Skullgirl in order to save her sister Umbrella, Parasoul had personally train Umbrella into anything she knows and has become fully aware of herself becoming the Skullgirl once she taught her sister how to fight as she shortly became the crown queen of the Canopy Kingdom while marrying one of her loyal soldier named Adam and gave birth to their daughter named Erin. When the Skull Heart was almost controlling the future queen, Parasoul gave her throne to her sister and did the same thing that her own mother did when she almost destroyed the world. Knowing what happened to her older sister, Umbrella and her elite military squad known as the Black Egrets went on a search for Parasoul. After defeating the Skullgirl, which turns out to be Parasoul, Umbrella uses the Skull Heart to let her live and the Skull Heart granted her wish as it told her that Parasoul's daughter will become the next Skullgirl when she gets the same age as her mother. With all of their might and power, Parasoul, Adam, and Umbrella make sure that Erin does not become the Skullgirl and will train her once she turned twenty-five in their hope to defeat the new Skullgirl and destroy the Skull Heart.
Years later, Erin was now a fearless twenty five year old woman becoming the next leader of her mother's elite military squad: the Black Egrets who help capture evil to their rightful justice. She can always rely on the strength and leadership of her royal family. She was later with her aunt and cousin at the throne room once her parents entered in as if they want to tell her something important.
"We're proud of you leading the Black Egrets, Erin." Umbrella said with a smile. "Let's celebrate. I want ice cream!"
"Aunt Umbrella, get serious." Erin replied seriously. "Besides, you and mom are the ones who wants me to join in. Now why am I here?"
"Because we all admire you beating up bad guys and KO moves!" Erin's cousin Nancy replied coldly. "But you are always so serious about protecting the kingdom even though its Aunt Parasoul and Uncle Adam's job."
"Quiet, Nancy." Umbrella sneered.
"Well, your mother and I have a mission for you." Adam responded.
"Really?" Erin echoed eagerly. "A mission?"
"Of course." Parasoul said. "One of the soldiers reported that there's a new Skullgirl out there that needs to be destroyed. She's at New Meridian."
"What is a Skullgirl?" Erin asked.
"She's a dangerous and twisted creature that only wields the Skull Heart if her heart is impure." Parasoul explained. "Your grandmother was once a Skullgirl to band the three nations together, but she lost her life because of it."
"Oh my!" Erin gasped. Then she had gained confidence inside of her. "Don't worry, mother. I will destroy the Skullgirl and respect our kingdom's honor once and for all!"
"And I'm coming with you!" Nancy declared.
"No, Nancy!" Parasoul refused. "You're staying here!"
"Come on, Aunt Parasoul!" Nancy yelled. "I've been training many times than Erin! I want to join!"
"Sorry, Nancy." Umbrella said, comforting her daughter. "But this mission is far too dangerous for you. Someday, you'll understand."
"The only thing I understand is that I'm embarrassed to relate with all of you!" Nancy shouted. "Being princess? What a joke!" Then, she runs off out of the throne room.
Erin tried to run after her cousin, but Adam held her back.
"I'll talk to her." Adam said calmly. "You go after the Skullgirl with the troops."
"I suppose your right." Erin said, giving her father a sigh. She went to grab her mother's umbrella and ran out to face her troops. "Black Egrets, roll out!"
Before Erin got on her motorcycle, she felt pain inside her chest as if her heart just stops pumping. She shook her head and slowly got on her vehicle and drove off once she recovers.
Meanwhile, Nancy was in her room just in time to see the Black Egrets leaving. She wasn't going sit in her room and do nothing. She grabbed her mother's living umbrella and jumped out of her window to land inside the tanks while Adam came in to watch his niece in the military tanks.
"Oh, brother." Adam said with a sigh.