A member of the Scarlet Devil Mansion staff who serves as the gatekeeper. Having always stood in front of the gate, she was overjoyed to hear about the beach trip. Perhaps due to the core strength developed through martial arts, she seems to be quite good at surfing. While assisting Sakuya, she appears to be enjoying herself to the fullest. (Refers to Sakuya as Sakuya-san, Koakuma as Koakuma-san, Remilia as Milady, Patchouli as Lady Patchouli, and Flandre as Lady Flandre.)

The Head Maid of the Scarlet Devil Mansion. While enjoying herself as everyone frolics in the sea, she continues to fulfill her duties as a servant by preparing parasols and shaved ice. She looks satisfied seeing Flandre and Remilia having such a good time. (Refers to Meiling as Meiling, Koakuma as Koa, Remilia as Milady, Patchouli as Lady Patchouli, and Flandre as Lady Flandre.)

A member of the Scarlet Devil Mansion staff who works as Patchouli's familiar. She had been looking forward to the beach trip and started frolicking the moment they arrived. Apparently, she prepared a rather daring swimsuit just for this occasion. She plans to stretch her wings by floating in the sea and playing with Flandre. (Refers to Meiling as Meiling-san, Sakuya as Sakuya-san, Remilia as Milady, Patchouli as Lady Patchouli, and Flandre as Lady Flandre.)

A member of the Scarlet Devil Mansion who usually spends her time reading in the underground library. Because of the heat, she had no intention of going to the beach, but Flandre and Koakuma eventually persuaded her. Although she mostly just reads books while eating shaved ice under a parasol, she seems to be enjoying the beach in her own way since it's a fresh experience. (Refers to Meiling as Meiling, Koakuma as Koa, Remilia as Remilia, Sakuya as Sakuya, and Flandre as Flandre.)

The head of the Scarlet Devil Mansion. She is pleased to see her younger sister Flandre having so much fun. Since vampires are not supposed to be out in the sun, she is protected from burns by sunscreen and Patchouli's magic. However, heat is still heat, so she spends most of her time under a parasol chatting with Patchouli and enjoying wine that Sakuya brought in a cooler box. If Flandre asks her to play, she will step out from the shade to join her. (Refers to Koakuma as Koa, and everyone else by their names without honorifics out of affection.)

A member of the Scarlet Devil Mansion and Remilia's younger sister. She was the one looking forward to the beach trip the most. As soon as they arrived, she pulled out a beach ball and a floatie in high spirits. Since vampires are not supposed to be out in the sun, she is protected by sunscreen and Patchouli's magic. Since they're at the beach, she really wants to play with her older sister, Remilia. (Refers to Koakuma as Koa and Remilia as Big Sister, and everyone else by their names without honorifics out of affection.)