Chika Idol wo Kage de Sasaeru Ore地下アイドルを影で支える俺; Underground Idol & I; Supporting an Underground Idol from the Shadows; Podziemna Idolka i Ja; Eu apoio uma Idol Desconhecida dos Bastidores

Kageyama, an unremarkable boy, secretly receives a message from gal classmate Natsukawa , saying, Meet me at the usual karaoke place after school. He goes to karaoke with her alone. There, Kageyama reveals something he had been asked by Natsukawa to show her.