Yukarism

From Omari's Sister: Yukari, at the tender age of 17, is a renown Edo period novelist who claims visions of Yoshihara during the Edo period gush from his heart. After meeting Mahoro, a girl he swears he knows and has met before, Yukari finds himself falling asleep and waking up in the Edo period as an Oiran. The past and present collide in this time traveling romance.