Despite her status as the school idol, Neiko Futaba's true personality is shrouded in secrecy, known only to her younger twin brother Otohiro. He bears the burden of her excessively attached demeanor, which troubles him greatly. In addition, Neiko relentlessly pursues her brother's affection through various means. However, such advances are commonplace in the Futaba household, much to Otohiro's chagrin (or relief).