In the dimly lit practice room, Roselia's members find themselves alone, their instruments silent. But the air is thick with tension. Kasumi, the fiery bassist, can't resist the urge to touch herself, her fingers dancing over her body as she imagines the forbidden. Her bandmates, unaware, soon join her, their moans of pleasure echoing in the empty room. They're interrupted by a sudden noise, forcing them to hastily rearrange their clothing, leaving them breathless and yearning for more.