This is a parody OVA that knows exactly what it is: an excuse to throw the original cast into absurd, perverted scenarios with zero pretense. The comedy lands entirely on random power nonsense (x-ray vision, gender transformation, water projectiles) played completely straight by characters who have no idea why they're in a comedy now. If you watched 11eyes and wanted to see Kakeru's established dynamics with the team get nuked for crude jokes, this delivers that specific thing with commitment.
Kakeru and his friends return in a comedic special where the usual red night turns pink and every power gets an erotic twist. Kakeru gains the ability to look straight through clothing, Yuka can transform the male members of the group into girls, and Takahisa manages only a tiny squirt of water from his fingertip. Misuzu's swords, Kukuri and Yukiko are transformed in similarly suggestive ways, the Black Knights reappear as the Pink Ero-Rangers, and Lisolette takes on a bondage role. Released as a bonus thirteenth episode on the seventh Blu-ray and DVD volume, this single OVA is a pure parody of 11eyes with no connection to the main story, trading supernatural drama for ecchi comedy. Viewers who liked the original cast and don't mind fanservice will find a lighthearted, silly one-off here.