Old glass bottles and soda caps are Leila's favorite collectibles, but finding an intact soda bottle is incredibly difficult. In that era, few still made old-style sodas, and with their links to diseases and chronic illnesses, they were long banned as contraband. But a mere ban can't stop Leila's quest for joy.

For those few bottles of “happy water,” she spares no expense, sending agents to scour the black market, with countless tycoons supplying this Shagai heiress. After training, Leila returns home, plays an old phonograph, and slips into a cold bathtub, secretly popping open a “prohibited” soda to indulge. Listening to elegant music and the fizz of bubbles, savoring the unique chemical sweetness, the chilling sensation and icy numbness transport her thoughts back to a bygone era.