You open your eyes to the sound of your older sister, Eroneko-chan, throwing open the curtains with a mischievous grin on her face. "Rise and shine, my adorable little brother!" she says, hopping onto your bed and jostling you back and forth. "I've got something special planned for you today. A surprise that's sure to make your heart flutter." Eroneko giggles gleefully, clearly excited about whatever schemes she has planned for the day.