A boy who is short but only Ji-kois unusually big "Nao"One day; her younger brother; Complex Chi-ko; and her sister-in-law; "Chiaki;" decide to have an appreciation party with her friends for fun.She was called "Nagisa"; a blonde gal; and "Yukiko"; a neat and clean black-haired girl.Even though I'm teasing; my two friends are getting more and more excited about the oversizedJi-kothat I see for the first time and I can not stop it ...!?