ラブコメ漫画に入ってしまったので、推しの負けヒロインを全力で幸せにする (Series) favorite_border

[DeepL Translation - needs review] Volume 1: My guess is the losing heroine!　If that's the case, I'll definitely give you a happy ending! If your guess is a defeated heroine?　Then I'll make sure there's a happy ending for you! In the world of a popular romantic comedy manga, I've become a friend of the main character, and I have only one mission. My only mission is to make the heroine, Sei-chan, happy! The popular and sweet romantic comedy from Kakuyom is now available as a comic book!

(Translator: DeepL)