Aoi Tokura is a server at Rainy Color, a cozy and diverse cafe known for its hot cocoa. Along with barista Shion Koga, Aoi serves a small crowd of regulars who are attracted by his girlish good looks. When two handsome college students start frequenting the cafe as well, Aoi cannot help but be drawn into their lives.

On the surface, high school students Naomi Katagaki and Ruri Ichigyou seem to be polar opposites. In contrast to Naomi's shy and timid personality, Ruri strikes fear in her classmates due to being rather cold and outspoken. Nevertheless, both Naomi and Ruri nourish a strong passion for reading, which gradually draws the two closer. As Naomi spends more time with Ruri, he discovers that she has a sweet side and is not as intimidating as everyone thinks. Subsequently, he develops genuine feelings for Ruri and decides to confess his love to her, which she happily reciprocates. However, their wholehearted relationship is disrupted when Ruri gets struck by lightning, causing her to enter a coma. Wanting to see her smile again, Naomi resolves to return Ruri to her everyday life—no matter how great the lengths he must stride are.

Ame-iro Cocoa: Rainy Cocoa Goes to Hawaii!! Nozomu Tokura, who is Aoi's older brother, is appointed as the manager of the Hawaii store. With more new characters, will he be able to open up the store there successfully?

A young Taiwanese assassin codenamed Glass Heart committed suicide by jumping off a building, and her heart was pierced by metal fence. Miraculously, her life was saved by heart transplantation. During her recovery she began to experience strange dreams, which lead her to Japan looking for the donor of her heart, who happens to be Kaori Makimura, former partner of City Hunter Ryo Saeba. The author mentioned in the first tankoubon volume that Angel Heart only shares the same characters of City Hunter but not its continuation. The events are all parallel universe, therefore it has nothing to do with City Hunter. (Source: Wikipedia)