Enters A Strange World
The protagonist enters (or finds out about (I use the word "discover" if such a thing happens)) a "world" (using this term loosely) / time period unlike their own. Does not include entering a game (game aspects are accepted...
Light Novels
(Most can be found on novelupdates.com) Not on here: Against the Gods; Dragon Dragon Dragon; A Mistaken Marriage; Albert Ke no Reijou wa Botsuraku wo go Shomou desu; An Otome Game’s Burikko Villainess Turned into a Magic...
Long Animes
40+ episodes
Short Manga
Under 30 chapters when completed.