Since I've Entered the World of Romantic Comedy Manga, I'll Do My Best to Make the Losing Heroine Happy

Story:

In the world of a popular rom-com manga, my only mission as the friend of the MC is to make the losing heroine, Sei-chan, happy! "I'll definitely make you happy. Please go out with me." "W-Wait, what!? Y-You're being serious…!?" The manga adaptation of the sweet rom-com from Kakuyomu starts now!