An invitation to a spa resort arrives at Death Cram School, and four of the girls are thrilled. Yumi objects that they have been slacking off far too much, so Shiki settles the dispute with a round of boob rock-paper-scissors, which she wins, and everyone heads to the pool. Girls from Hanzoo Academy, the Homura Crimson Squad and Hebijo Clandestine Girls' Academy turn up as well. Asuka suggests they all simply enjoy the day, and the groups agree to a temporary truce. When a trivial matter sparks a bitter argument, Yumi proposes settling it with a showdown in the manner of the shinobi of old. A single-episode OVA that mixes action, comedy and ecchi fanservice, bundled with a premium edition of the Senran Kagura: Estival Versus game.