時計仕掛けのレイライン －残影の夜が明ける時－

Michiru and Ushio continue to spend their days solving problems at Tenbinruri Academy as part of the special investigation office, otherwise known as ‘Tokusa’. One day, a foreign girl named Adelheid came to seek their help in looking for her grandmother’s memento. Along the way, will they find out more about the link between the day and night worlds? [From Hau~ Omochikaeri!]