One would first think that it'd be your generic isekai given the first few seconds (but it's not really that), likely focusing on cute rediscovery. You'd think otherwise, just as the episode progresses. I like the way the mystery was kept in between and have them naturally blend with what seems to be the prelude for an even more interesting plot rather than what it initially try to project. This ep is a perfect introduction for people who love being curious (and confused subtly).