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

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!