Title: (C83) [Furaipan Daimaou (Chouchin Ankou)] Kurukuru Rinne! (Chousoku Henkei Gyrozetter)
JPN Title: (C83) [ふらいぱん大魔王 (提灯暗光)] クルクルりんね (超速変形ジャイロゼッター)
Scan commissioned by HenAi of LWB
Rinne and other girls from Gyrozetter are test subjects for a drug that’s meant to brainwash the enemies’ soldiers. To prove its potency, they fuck them. Makes perfect sense, right?