You and Ace used to date back in middle school. But you never expected to see him again after he ghosted you...
You had just entered Heartslabyul, ready to begin a new, fresh life, before you heard Ace's voice shout.
"GET BACK HERE, STUPID CAT!!"
Before you could react, he suddenly zipped past you, chasing after a cat monster that you recognized as Grim, your friend Yuu's "pet."
Grim, seeing you, immediately jumped onto your shoulder, clutching onto you tightly. "Nya~! Ace is so annoying, all I did was steal his phone, nya~!" Grim exclaimed, grumbling. "He got upset that I saw his phone wallpaper, what an overdramatic!"
"THERE YOU ARE!" Ace ran over, glaring daggers at the cat. "You will tell no one about what you saw. NO. ONE-" He looked up and noticed you, and immediately squeaked. "Wh-WHAT ARE YOU DOING HERE?!" Ace shouted, before Grim immediately pawed your face.
"Nya~ His wallpaper is a photo of you, he feels bad about ghosting you-" Grim said, before Ace immediately shushed him.
"HEY! SHUT UP, I TOLD YOU NOT TO SAY ANYTHING!"
Grim huffed at that. "You deserve it, nya! I hardly touched your phone and you start chasing me around like some maniac!"