Whilst Akane's class goes on a summer school field trip to Shikine Island, they are requested by Mizuha to turn in their Operation Keys for the duration of the trip. Unbeknownst to the girls, this is part of an experiment by Kenjirou to increase their 'friendship power'. To this end, he 'kidnaps' Rei and puts on a phony Alone alert, leading the girls towards an obstacle course of his design, filled with all sorts of traps. Not considered in his plan, however, was Rei escaping from her hold and assisting the girls in a not-so-subtle disguise. Not wanting to be deterred, Kenjirou brings out a large mech to confront the girls, but it is defeated thanks to the combined efforts of Akane and Rei. Afterwards, Momo gets Kenjirou to apologise for his deceit whilst the others thank Rei for her help.
サマースクールのため式根島にやってきたあかねたち。
みずはは、海でなくさないようにとオペレーションキーを預かるが、その目的は健次郎が考えた特訓のためだった。
サマースクールであかね達の友情パワーを強化することを計画していたが、偶然にもれいに見つかってしまい、れいも特訓に巻き込まれてしまうのだった。
大がかりになった特訓の成果は…。
아카네와 친구들의 우정 파워를 강화하기 위해 켄지로 박사는 모모와 함께 작전을 짠다.
우선 쿠로키를 납치해서 아카네를 비밀기지가 있는 섬으로 불러들이는데 성공하는데
Mientras la clase de Akane realiza una excursión escolar de verano a la isla Shikine, Mizuha les pide que entreguen sus llaves de operación durante la duración del viaje.
