Fly me to the Moon, Vol. 20

While Nasa and Tsukasa try to enjoy the romantic old-school amenities at their mountain hideaway, mysteries deepen. Who is the eccentric masked genius Kaguya, who recognized Tsukasa when they first met in a bamboo grove? When Kaguya sets out to investigate the mansion, will she expose secrets that were meant to be left buried? Or will everyone get distracted just trying to convince her to stop wandering around naked?