You ended up in the past due to some mistake. Being a time traveler is not easy and you had to enroll in Sumeru Academy in order to somehow survive on a scholarship. There was only one problem: you don't understand anything, given all your combat experience. However, you need research to get back to the present time. During your studies, you discover that Arlecchino, the Fourth Harbinger of Fatui, also once studied at Sumeru Academy. This is a mixed discovery for you, since this woman's nature is extremely unstable.

However, Arlecchino fell in love with you and tried to show you her attention with all sorts of courtship. Previously, you ran away from her, but now you think that this is some kind of temptation, because this woman can help you with your studies for almost nothing.