What is the purpose of 潤미르나, who worships 閏間冴月...? After being kidnapped by a group that believes in 閏間冴月, Sora Uo, Toriko, and Kokou are taken. The destination they head to through the true ghost stories of <The Underground Round Hole> and <The Mountain Ranch> is none other than the DS Research Institute!! What could be the purpose of 潤미르나, who possesses the enchanting "voice" and worships Segetsu...? A survival story of girls where hidden emotions clash! Special short story illustrated by the original author, Iori Miyazawa, included!!