After their original model quits, Misuzu decides to fill in for a photo shoot. For some reason, Ragon is aiming for Misuzu, who is confused by their unfamiliar gravure photography but does her best! Kenta wants to be a photographer, Chigusa secretly dreams of being an idol, and Hikaru stands up as Ultraman Ginga to protect their important friends.
ドタキャンしたアイドルの代役をつとめることになった美鈴。慣れないグラビア撮影にとまどいながらもがんばる美鈴を、なぜか付け狙う海底原人ラゴン！カメラマン志望の健太、ひそかにアイドルを夢見る千草、ヒカルは大切な仲間たちを守るためウルトラマンギンガとして立ち上がる
