Description:

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." "Wait a minute! Are you serious?" (Source: Newtype Web, translated)

Alternative Titles:

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, Rabukome Manga ni Haitte Shimatta no de, Oshi no Make Heroine wo Zenryoku de Shiawase ni suru