Sei and Reiji are advancing smoothly through the Gunpla Battle Championship. Then, on a certain day, a woman calling herself Mihoshi appears at the hobby shop owned by Sei's family. Sei immediately hits it off with Mihoshi, who has a wealth of Gunpla knowledge. Mihoshi makes a deep impression on Sei, and as he advances through the championship, she repeatedly comes to see him at school as well as at the store. Seeing the two of them happily discussing Gunpla, China is greatly disturbed. And Yuki, who is with her, feels an indescribable anxiety when he sees Mihoshi. On the day of the championship, Sei and Reiji are perfectly positioned to fight. But before them appears a singing woman named Kirara... Kirara, the Akihabara-style Gunpla idol!
En se préparant pour le deuxième tour du championnat, Sei semble tomber sous le charme d'une cliente ayant la même passion que lui.
ガンプラバトル選手権を順調に勝ち進んでいくセイとレイジ。そんなある日、セイの実家である模型店に、ミホシと名乗る一人の女性が現れた。豊富なガンプラ知識を持つミホシと、たちまち意気投合するセイ。仲良くガンプラ談義をする２人を見てしまったチナは、大いに動揺する。そして選手権当日。万全の体勢で戦いに望むセイとレイジ……そんな彼らの前に歌いながら現れた少女は、キララ。アキバ系ガンプラアイドル、キララであった……！
诚与岭司在高达模型对战锦标赛中节节获胜。有一天，诚家里所经营的模型店迎来了一位叫美星的女生。美星的高达模型知识渊博，诚与她一见如故。美星对诚的彪炳战绩深感佩服，为了见他一面，更跑来学校。千奈撞见二人亲密畅谈高达模型，深受打击…在场的结城见到美星，一丝莫名不安涌上心头。来到锦标赛当日，诚与岭司以完美状态出战…一位少女唱着歌出场，此人正是秋叶原高达模型偶像，琪拉拉！
