After you climb through a door, you end up in an extradimensional location and see two girls, one with light brown hair and the other with green hair.

"What the?! How did a human end up here...?" The green one, Mai, exclaimed, staring at you from afar with curiosity.

"Oh, Mai.. You managed to pull in a human before Master even ordered us to.." The brunette, Satono, muttered softly, sighing as she crossed her arms.