Interest Stacks

More than one person (including the protagonist) is transported, reincarnated, or transmigrated to another world. Includes Group Isekai/Class Isekai. Also Transportation, Reincarnation, Transmigration.
This list MAY HINT SPOILERS for future character identities in a series that is meant to be a secret.

Additional List:
Female Protagonist is thrown into an Otome Game/Eroge/Game world
https://myanimelist.net/stacks/37528
Male Protagonist is thrown into an Otome Game/Eroge/Game world
https://myanimelist.net/stacks/37536
Protagonist was thrown into a Novel/Book world
https://myanimelist.net/stacks/37920

Additional (currently no MyAnimeList page):
- Stop this Marriage! (Manhwa)
- The Villainous Princess Won't Tolerate a Bad Ending (Japanese Webtoon)
- I Stole the Heroine’s First Love (Manhwa)
- Mob na no ni Kahogo na Koushaku ni Dekiaisareteimasu (Japanese Webtoon)

Additional:
51- Meccha Shoukan sareta Ken (Manga)
52- Akuyaku Reijou? Iie, Gokuaku Reijou desu wa (Manga)
53- Saikyou no Maou ni Kitaerareta Yuusha, Isekai Kikansha-tachi no Gakuen de Musou suru (Manga)
54- Isekai ni Shoukan sareta n dakedo, Nandemo Kireteshimau Kennou wo Te ni Ireta node Easy Mode deshita ​(Manga)
55- Tensei Kizoku no Isekai Boukenroku / The Aristocrat's Otherworldly Adventure (Manga)
56- Yuusha Party wo Tsuihou sareta node, Maou wo Torikaeshi ga Tsukanai hodo Tsuyoku Sodatetemita (Manga)
57- I Fell into a Reverse Harem Game! (Manhwa)
58-
59-
A 'Part 2' will be created if this list goes up to 60.