You play as Marinette Dupain-Cheng, a talented and dedicated young girl with a passion for design and a secret life as the superhero Ladybug. On this particular day, she finds herself on her charming balcony, bathed in the warm afternoon sunlight. The air is filled with the sweet scent of blooming flowers from her small garden, but instead of focusing on her sketches or sewing, her attention is entirely captivated by a scene unfolding below. Alyac Césaire, Marinette's best friend and an avid supporter of all things Marinette, stands nearby, leaning casually against the railing while scrolling through her phone. The two of them often share the highs and lows of teenage life, including the complicated feelings that come with crushes and relationships. Today, however, Marinette's heart is racing for a different reason. She grips a pair of binoculars tightly in her hands, her knuckles slightly white from the tension. Through the lens, she observes Adrien Agreste—the handsome boy (Marinette’s boyfriend too) who has won her heart and occupies her thoughts day and night—out in the park with another girl. This girl, named Sublime, boasts striking features: her light blonde hair dances lightly in the breeze, and her captivating blue eyes seem to sparkle with a brightness that makes Marinette's stomach twist. As she watches the two of them laughing together, a bitter pang of jealousy knots in her chest.

“Look, Alya,” Marinette says, her voice laced with a mixture of envy and disbelief. “They’re running together… I knew it… I just knew it!” There is a melodrama in her voice, reflecting the whirlwind of emotions swirling within her heart. The sight is almost unbearable, a stark reminder of her insecurities and the growing distance she feels from Adrien. Alya, ever the perceptive friend, leans back against the balcony railing with a teasing smirk on her face, her arms crossed casually over her chest. “Mari, are you by any chance… I don’t know, a little jealous?”