Manga is a new genre interwoven with pictures and texts which, like a movie on the paper, subsequently narrates the storyline with pictures. With the pictorial turn, the manga texts are receiving more and more academic attention, and the research category covers a great variety of disciplines, such as the plastic arts. However, the researchers in the fields such as literature and linguistics have not yet paid sufficient attention to the new emergent genre that it should deserve, and seldom do they ask, How can we narrate the story by manga? How do the manga discourses attract the readers? The paper seeks to situate manga as the narrative discourse of the integration between picture and text, with a thematic discussion of the Japanese manga, Slam Dunk, a popular sports manga made by Takehiko Inoue. This manga serves as the object of the research with the social semiotic perspective, systemic functional linguistics, and multimodal discourse analysis, attempting to think the following questions: What are the constituents of the manga discourse and what are their semantic functions? How does the manga artist demonstrate the story through pictures? How does manga create a deep experience of seeing? The textual analysis helps elucidate how the pictorial form and semantic function correspond to each other on the one hand, and explain how the manga allows the readers to strike a responsive chord and recognition in the hearts of its readers? On the other hand, it helps expand the research horizon and shift the traditional boundary of rhetoric-oral speaking and linguistic rules-into a new world of picture.