Apologies for the OOC. This is a ridiculous idea.
I just suddenly wanted to see the cherished first love and the red mole of cinnabar meet. Please don't flame me if it's not your thing!
What if the three Systems inspired by Idol Princess accidentally bound themselves to the wrong people and dragged the three Hashira, Feng Shui Yan, to another world to hold a concert...
This is a what-if and derivative story set after the anime plot. Treat it as a parallel world, and please don't flame me if it's not your thing!
On the other side of the world lies a magical place called the Fairy Tale Kingdom, ruled by the Fairy Tale Queen and inhabited by all kinds of fairy-tale characters.
But as the Stars of Happiness keep disappearing, the kingdom faces the threat of destruction.
Later, with the help of Yukimori Ringo, Takashiro Reira, and Sasahara Natsuki, enough Stars of Happiness are gathered through song to protect the Fairy Tale Kingdom.
But after peace returns to the fairy-tale world, Princess Ariel, Sleeping Beauty, and Rapunzel mysteriously disappear, and their world teeters on the brink of collapse. At this point, three "Systems" created to bring peace to the kingdom volunteer to go to the human world and find the three missing princesses...
Rengoku Kyojuro, The Little Mermaid
Tomioka Giyu, Sleeping Beauty
Shinazugawa Sanemi, Rapunzel
"Your Highness! Your Highness! For the sake of peace in the kingdom and the safety of the fairy-tale world, please transform at once, collect the Stars of Hope, and help me find Princess Rapunzel!"
Shinazugawa Sanemi walked ahead, followed by a chubby little pig. Its four legs pattered along at a fast clip as it kept grunting and talking without a moment's pause. It was really annoying.
When Yuri the pig repeated this for the fifth time, Sanemi suddenly turned around, his expression terrifying enough to make a child cry at night. "Get lost! Or I'll stew you, you bastard!"
But Yuri acted as if he couldn't see Sanemi's expression. Instead, he lifted both legs into the air and held his chubby face in his hooves, looking unbearably smug. "Ahh, Your Highness's beauty is as captivating as ever. Even after saying something so cold and heartless, I still can't get angry at the princess!"
Sanemi shuddered with disgust. He picked up the pig and said impatiently, "Get a good look. I'm a man. If you're looking for a princess, at least find a girl!"
Yuri: "But Your Highness is a girl, isn't she?"
Sanemi angrily flicked Yuri on the forehead, then put the pig down and ignored him.
"Your Highness! Wait for me!"
Tomioka Giyu and a little sheep stared at each other in silence for a long time. In the end, the sheep couldn't take it anymore. As if by magic, it pulled a rose out of its wool and said to Tomioka Giyu, "Greetings, noble Princess! I'm Lian. Please help me find..."
"Your eyesight is poor."
"Huh?"
"You've got the wrong person."
"Huh, huh?"
"You can go."
"Huh!"
"Is Your Highness the princess going to abandon Lian?!"
Rengoku Kyojuro really liked the well-behaved sea hare, if you overlooked the fact that it kept trying to get him to wear a dress
"I really, really want to see Your Highness in a dress! Would you please grant me this tiny, tiny, tiny, tiny request?"
"Umu! No!"
"Why not, Your Highness? I even bought ten dresses shaped like your mermaid tail and five dresses for your normal form online! I really want to see you in them!"
"No! Because I'm a man! I'm sorry to refuse you, Sebastian, but I still can't do it!"
"Wahhh... Your Highness turned me down."
"Crying won't help! You've already fake-cried three times!"
"Aah, (Darn, he saw right through me!)"
P.S. I laughed at my own idea after writing this. I didn't mean to torment them.
Theme: Princesses will always be our gods