以ROBO-ONE第一名为目标，秋穗找出当年机器人社赢得ROBO-ONE的作品、挂名荣誉社长的机器人“种子岛机器3号”，但却因为太老旧而无法使用。秋穗努力地克服障碍、终于改装好“种子岛机器3号改”，但又遇到了新的障碍：操作方式太过复杂。此时，因为连续几天太过拼命、疲惫过度的秋穗旧疾发作了‧‧‧

以ROBO-ONE第一名為目標，秋穗找出當年機器人社贏得ROBO-ONE的作品、掛名榮譽社長的機器人“種子島機器3號”，但卻因為太老舊而無法使用。秋穗努力地克服障礙、終於改裝好“種子島機器3號改”，但又遇到了新的障礙：操作方式太過複雜。此時，因為連續幾天太過拼命、疲憊過度的秋穗舊疾發作了‧‧‧

Needing a robot for the tournament, Kaito and Akiho find an old Tanegashi Machine hobby robot in storage, only to find its batteries have run out. Akiho goes to see an old man named Tetsuharu 'Doc' Fujita to try and get some new parts, but finds they are too expensive. Kaito asks shopkeeper Mizuka Irei to look into any weaknesses Doc may have so he can lower his prices. This leads Akiho to meet Doc's granddaughter, Junna Daitoku. Although Junna fails to be much help, Akiho manages to get the parts needed thanks to an advanced allowance and a promise that they'll pay with the prize money. After repairing the robot, Akiho and Kaito work on controlling it, with Kaito also having to deal with Akiho's 'elephant mouse syndrome', an ailment she got following an accident seven years ago in which time fasts forward for her. Noticing her fatigue, Kaito agrees to be the robot's operator on the condition that she makes the controls similar to his favourite game, Kill Ballad.

Déterminée à remporter le Robo-One, Akiho décide d’utiliser Tanegashimachine 3, le robot président honoraire de son club. Malheureusement pour elle, ce robot bipède, qui n’a plus servi depuis huit ans, ne fonctionne plus. La jeune fille va donc s’employer à remédier à ce problème.

ROBO-ONE優勝を目指し、あき穂は過去のROBO-ONE優勝ロボットでありロボ部名誉部長タネガシマシン３を使おうとするが古すぎて動かない。周りの協力を得て、何とかタネガシマシン３改を完成させるが、今度は操作方法が難しすぎて・・・　さらに連日無理をしたあき穂は持病である「発作」が起きてしまう。

2주밖에 남지 않은 로보원의 우승을 위해 아키호는 동방에서 8년 전에 언니가 썼던 하비로봇 ‘타나가시머신 3’을 찾아낸다. 그러나 이미 오랜기간 동안 사용하지 않았던 타네가시머신은 전원조차 들어오지 않는데... 아키호는 귀찮아하는 카이토를 데리고 고물상으로 향한다.

Al necesitar un robot para el torneo, Kaito y Akiho encuentran un viejo robot de hobby de la Máquina Tanegashi en el almacenamiento, solo para encontrar que sus baterías se han agotado. Akiho va a ver a un anciano llamado Tetsuharu 'Doc' Fujita para intentar obtener algunas piezas nuevas, pero encuentra que son demasiado caras. Kaito le pide al comerciante Mizuka Irei que investigue cualquier debilidad que Doc pueda tener para poder bajar sus precios. Esto lleva a Akiho a conocer a la nieta de Doc, Junna Daitoku.