My Friend the Harem Protagonist

Haru risks life, limb, and popularity to protect his friend Shin from four broken hearts. What would happen if a Harem protagonist started dating the first girl? How would the other four deal with their unrequited love? Haru schemes to protect his best friend's new relationship. Joined by a diligent delinquent, how far will they have to go to protect the clueless Harem protagonist?