Demon Astaroth's Arrival!!

Demon Astaroth's Arrival!! is chapter 32 of the Boku wa Tomodachi ga Sukunai light novel series. It is chapter nine of volume three.

Summary
A day after their failed outing at the pool resort, Yozora sent a group message to the Neighbor's Club telling them to bring their swimsuits. Arriving in the clubroom moments later, Kodaka, along with Sena and Kobato, surprisingly found a person wearing a horse mask with a striped full-body swimsuit. Revealing that person to be Yozora, Kodaka asked why they were asked to bring their swimsuits. In reply, Yozora explained that she didn't want her newly-bought swimsuit to go to waste and claimed that it's embarrassing for her to show up a lot of skin in public but Sena added that it's not allowed while wearing a horse mask, much to Yozora's shock. Meanwhile, Rika revealed to Kodaka her swimsuit which Rika added that it's a special kind of swimsuit that will turn her naked after she and Kodaka would go to a mixed bath together, much to Kodaka's disgust. Afterward, Maria entered the clubroom and was harassed by the horse-mask wearing Yozora which was accompanied by Kobato. When dropping the horse mask unto Maria's head, claiming it's controlled by dark powers, it resulted in another fight for attention (from Kodaka) between Kobato and Maria as Sena declared that they will use their private beach and villa as a training camp. Once the decision was consolidated by most of its members, the Neighbor's Club's next activity was settled.