In Okayama Prefecture, there is a minor underground idol group called 'ChamJam'. Among them is the shy and introverted member 'Maina', who ranks lowest in popularity. However, there is an enthusiastic fan who dedicates their entire life to supporting her. This legendary lady, 'Eripiyo', loves Maina so much that she ends up nosebleeding during live performances! Until the day Maina stands on the Budokan stage... Eripiyo's idol otaku activities, fueled by all her strength and soul, will continue!