|This article is about a/an episode in Kamen Rider Fourze.|
Star Follower Selection (星・徒・選・抜 Hoshi・To・Sen・Batsu) is the thirty-seventh episode of Kamen Rider Fourze.
Gentaro, Yuki, Kengo, Tomoko, Ryusei, the student council president Sugiura, the former Pyxis Zodiarts Hiroki Makise, and transfer student Erin Suda are chosen for an astronaut test in a closed environment and endurance test, but Kengo's weak constitution and the arrival of the Aquarius Zodiarts cause trouble for the group.
At the JAXA, while looking for Yuki, Gentaro finds another girl named Erin Suda whom he was about became quick friends when Yuki arrives as she hints the day her dream is realized comes. However, the two girls get off on the wrong foot when Yuki's talk about a "Rocket God" seems to annoy Erin. Soon after, Gentaro learns from a broadcast by Hayami that the school is having its annual exam to determine who can enroll in Space International Development Agency's astronaut test.
Though both would have failed, Gentaro and Yuki are saved by the bonus question thus joining Kengo, Ryusei, and Tomoko along with the other 16 that includes Erin. They are soon greeted by astronaut Chinatsu Hyuga who tells them they are to be split into groups and to spend 72 hours in an Isolation Chamber for a Productivity Test where they needed to make ten thousand paper cranes.
Tensions get high, with Ryusei losing his cool and being eliminated; the others assume it was on purpose so he could fight any Zodiarts that might show up, but he isn't willing to admit he was legitimately panicking. Kengo does his best to calm everyone down, but when his health problems rear their head, the Aquarius Zodiarts appears from out of nowhere and uses her waters on Kengo. With Tomoko using the origami to block the cameras, Gentaro become Kamen Rider Fourze and fights the Aquarius Zodiarts as they take their fight outside before he assumes Cosmicstates. However, his Limit Breaks have no effect on the Horoscope as Fourze learns that the Aquarius Zodiarts is Erin. Finding Erin at JAXA, Gentaro learns of Erin's reasons for helping Kengo and why she hates Yuki so much. Erin's father was also an astronaut candidate and a hard worker, but ended up losing out to a man who was less skilled but more charismatic; she sees Yuki as the same kind of person, and absolutely refuses to lose to someone like that.
Seeing he cannot reach her, Gentaro's proposes for Erin to give him her Aquarius Switch if Yuki does beat her. In the second test, with Tomoko and Kengo transferred to another team, the groups are to each assemble a robot within three hours. After Tomoko's group presents a robot modeled after Shun, Yuki and the rest of Team B present a robot cat, which angers Erin as it differs from the design she suggested. Returning to the chamber, Erin finds something that enrages her and leads her to attack Yuki before Gentaro drags her off. However, as Kamen Rider Meteor holds the Libra Zodiarts at bay, Gentaro becomes Fourze to restrain the Aquarius Zodiarts to find out what happened. When Dustards arrive, the two Kamen Riders' fights are brought together.
After loaning Kamen Rider Meteor Storm the Fire Switch, Fourze assumes Cosmicstates as the two Kamen Riders use their Limit Breaks. However, Aquarius heals herself before revealing that Yuki hid a key piece of machinery from the last test, preventing the team from following Erin's original plan, which Erin believes was cheating. However, Fourze refuses to believe that Yuki to do such a thing as Aquarius proceeds to whip him relentlessly.
- Switches Used:
- States Used:
- Basestates, Cosmicstates
- Gentaro Kisaragi (如月 弦太朗 Kisaragi Gentarō): Sota Fukushi (福士 蒼汰 Fukushi Sōta)
- Kengo Utahoshi (歌星 賢吾 Utahoshi Kengo): Ryuki Takahashi (高橋 龍輝 Takahashi Ryūki)
- Yuki Jojima (城島 ユウキ Jōjima Yūki): Fumika Shimizu (清水 富美加 Shimizu Fumika)
- Miu Kazashiro (風城 美羽 Kazashiro Miu): Rikako Sakata (坂田 梨香子 Sakata Rikako)
- Shun Daimonji (大文字 隼 Daimonji Shun): Justin Tomimori (冨森 ジャスティン Tomimori Jasutin)
- Tomoko Nozama (野座間 友子 Nozama Tomoko): Shiho (志保)
- JK (ＪＫ（ジェイク） Jeiku): Shion Tsuchiya (土屋 シオン Tsuchiya Shion)
- Ryusei Sakuta (朔田 流星 Sakuta Ryūsei): Ryo Yoshizawa (吉沢 亮 Yoshizawa Ryō)
- Chuta Ohsugi (大杉 忠太 Ōsugi Chūta): Takushi Tanaka (田中 卓志 Tanaka Takushi)
- Kouhei Hayami (速水 公平 Hayami Kōhei): Kousei Amano (天野 浩成 Amano Kōsei)
- Kou Tatsugami (立神 吼 Tatsugami Kō): Kazutoshi Yokoyama (横山 一敏 Yokoyama Kazutoshi)
- Narration (ナレーション Narēshon): Nobuyuki Hiyama (檜山 修之 Hiyama Nobuyuki)
- Erin Suda (エリーヌ 須田 Erīnu Suda): Karen Takizawa (滝沢 カレン Takizawa Karen)
- Chinatsu Hinata (日向 千夏 Hinata Chinatsu): Aya Nakamura (中村 綾 Nakamura Aya)
- Yuta Sugiura (杉浦 雄太 Sugiura Yuta): Kenta Itogi (絲木 建太 Itogi Kenta)
- Hiroki Makise (牧瀬 弘樹 Makise Hiroki): Takafumi Shinohara (篠原 孝文 Shinohara Takafumi)
- Examinants: Satoshi Hori (堀 聡志 Hori Satoshi), Junichi Kikawa (木川 淳一 Junichi Kikawa)
- Students: Takanori Shimizu (清水 貴紀 Shimizu Takanori), Aimi Ito (伊藤あいみ Itō Aimi)
- Erin's father: Berndt Otto
- Astronaut: Matthew Carlsen
- As part of Super Hero Time, this episode aired alongside Tokumei Sentai Go-Busters episode, Mission 14: Ça va? Rescue Operation.
- Viewership: 5.8%
- First appearance of Aquarius Zodiarts.
- When Meteor inserts the Fire Switch into his Driver, it plays the relevant insertion sound for the Fourze Driver, not the Meteor Driver.