|This article is about a/an episode in Engine Sentai Go-Onger.|
Campus Secret (学園ノヒミツ Gakuen no Himitsu) is the forty-second episode of Engine Sentai Go-Onger.
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When Bin Banki starts mixing up recyclables into the regular trash, the Go-Ongers easily force him to run with them in pursuit. However, the Go-on Wings find Kegalesia has become a teacher at the nearby Todorokigaoka Private High School. Unable to get into the school, the two report to the Go-Ongers with Bomper suggesting one of them to pose as a student to get to the bottom of it.
Miu volunteers and goes undercover at the school as a shy girl to find where Kegalesia is. After searching through many school clubs, Miu runs into the prodigy Manabu Yushima, who becomes interested with her and attempts to use the Cupid's Arrow spell to make her love him. Revealed to be in possession of an item from the Braneworld known as the Magic World, Yushima runs off to his sole confident, Kegaleshia as the school nurse. After revealing herself, the Minister has Bin Banki get back the Mage's Wand and knocks Miu out to give to Yushima, who returns the favor by upgrading Bin Banki into Mahōbin Banki. As Mahōbin Banki uses his new magic powers to force the Go-ongers to attack each other against their will, Yushima attempts to make Miu his girl only to unable to with his magic. But after convincing him to use his true heart to win her love, Miu arrives with Yushima and the two strip Mahōbin Banki of his magical powers before Go-on Silver defeats him.
But when the Industrial Revolutionized Mahōbin Banki is overpowered by Engine-Oh G9, the combination is broken up by a mysterious figure with Go-on Red using Kyoretsu-Oh to scrap the Savage Machine Beast. Soon after, as Yushima accidentally destroyed his laptop and data he gathered of the magic spells, the Go-Ongers were curious about the mysterious sniper who attacked them.
- Sosuke Esumi (江角 走輔 Esumi Sōsuke): Yasuhisa Furuhara (古原 靖久 Furuhara Yasuhisa)
- Renn Kousaka (香坂 連 Kōsaka Ren): Shinwa Kataoka (片岡 信和 Kataoka Shinwa)
- Saki Rouyama (楼山 早輝 Rōyama Saki): Rina Aizawa (逢沢 りな Aizawa Rina)
- Hant Jou (城 範人 Jō Hanto): Masahiro Usui (碓井 将大 Usui Masahiro)
- Gunpei Ishihara (石原 軍平 Ishihara Gunpei): Kenji Ebisawa (海老澤 健次 Ebisawa Kenji)
- Hiroto Sutou (須塔 大翔 Sutō Hiroto): Hidenori Tokuyama (徳山 秀典 Tokuyama Hidenori)
- Miu Sutou (須塔 美羽 Sutō Miu): Yumi Sugimoto (杉本 有美 Sugimoto Yumi)
- BOMPER (ボンパー Bonpā, Voice): Akiko Nakagawa (中川 亜紀子 Nakagawa Akiko)
- Engine Speedor (炎神スピードル Enjin Supīdoru, Voice): Daisuke Namikawa (浪川 大輔 Namikawa Daisuke)
- Engine Jetras (炎神ジェットラス Enjin Jettorasu, Voice): Kiyotaka Furushima (古島 清孝 Furushima Kiyotaka)
- Engine Jum-bowhale (炎神ジャンボエール Enjin Janboēru, Voice): Tomomichi Nishimura (西村 知道 Nishimura Tomomichi)
- Water Pollution Minister Kegalesia (害水大臣ケガレシア Gaisui Daijin Kegareshia): Nao Oikawa (及川 奈央 Oikawa Nao)
- Air Pollution Minister Kitaneidas (害気大臣キタネイダス Gaiki Daijin Kitaneidasu, Voice): Mitsuaki Madono (真殿 光昭 Madono Mitsuaki)
- Bin Banki (ビンバンキ Bin Banki, Voice): Wataru Takagi (高木 渉 Takagi Wataru)
- Cleaning Minister Kireizky (掃治大臣キレイズキー Sōji Daijin Kireizukī, Voice): Eiji Takemoto (竹本英史 Takemoto Eiji)
- Manabu Yushima (湯島 学 Yushima Manabu): Ren Mori (森廉 Mori Ren)
- Teacher: Hiroyuki Muraoka (村岡 弘之 Muraoka Hiroyuki), Kota Goto (後藤公太 Gotō Kōta)
- Student: Fumihito Sekine (関根史仁 Sekine Fumihito), Masaya Tagana (多賀名将也 Tagana Masaya)
- Director: Hayato Kazuka (春日勇人 Kazuka Hayato)
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- As part of Super Hero Time, this episode aired alongside Kamen Rider Kiva episode 43, Wedding March: Time of Parting.
- Engine Narrator: Engine Speedor
- Engine Eyecatch Race Winner: Engine Speedor ("Speed #1, the red star!")
- Go-On Seminar: Why does Jum-bowhale suddenly appear whenever he's needed?
- Answer: He has the ability to fly to anyone who needs his instruction.
- This episode bears some similarities to Samurai Sentai Shinkenger episode "The Manipulated Academy", With one of the enemies going into a private school undetected with one of the team-members going in to the school to investigate.
- Miu's infiltration of a school and use of a yo-yo as a weapon (as well as her revealing of the Go-On Wings symbol hidden inside the yo-yo) is an homage to the manga and TV adaptation Sukeban Deka.
Engine Sentai Go-Onger DVD Volume 11 features episodes 41-45.
The Blu-ray release of Engine Sentai Go-Onger Volume 3 features episodes 34-50.