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

I was sent into the world of a popular rom-com manga, and into the body of the male lead's best friend. Now I have the chance to make my dream come true: to make Sei-chan, the losing girl of the manga, happy! "I can give you all the happiness you deserve, so please go out with me