Suguru-kun Fight!

When Suguru, an ordinary high school student, comes home as usual, he bumps into his older sister's friend, Noriyuki! Deciding at first glance that the huge and rugged-looking Noriyuki is the type he doesn't like, Suguru leaves the house to escape from him, but for some reason Noriyuki starts to pester him persistently...!? (Source: Core Magazine, translated) Note: Includes three extra chapters.