Nakama o Mamotte Shindara Nijuunen-go no Onaji Sekai ni Umarekawatta Ken…… demo Ore, Tensei Nikaime nandakedo? - Ch. 1

[watanuki-kimihiro]

My God, it's actually "Isekai Big Boob Vampires", the fake manga the protag reads in Nagatoro

 

[MontDilanus1343]

Where did you read the WN?

Where to read novel?

Main Manga page -> Track -> NovelUpdates.
That links the LN. Click "Related Series" for the WN.

It's not completely translated, so you need to web-search the Japanese name to find the Syosetu page.
Then read it in native Japanese or use some sort of translation tool like Google Translate.

Note NovelUpdates is a release tracker / book review page. Not a hosting site.