This crossover event is set at Milady's Masion from Episode 1 (Najica Blitz Tactics) where Madam is waiting for her personal contracted killers (White Delmos from Agent Aika) because she's gotten a sexy, special delivery for them today... But maybe she's just keep it instead...

The crossover event that no one expected (or particularly wanted)! In the land known only as Gamindustri, a flirtatious NPC named Nepgeo sits her friends down at a slumber party and tells them all a little story about her idol; her very own inspiration. How perverted will this yuri story get? And, is everything really as it seems?...