Rain is a barista associated with the Rainy Color café in the Rainy Cocoa anime series, appearing in the third season set in Hawaii. He is a young man with dark hair and blue eyes. His outward manner is calm and reserved, which can initially make him seem cool or distant, but he is genuinely kind and attentive, especially toward his coworkers and the café's customers. He is a skilled barista and takes clear pride in his work.

Rain is introverted and enjoys spending time alone, often playing guitar and writing music. He has a strong sense of aesthetics and is highly attuned to his surroundings. Beneath his quiet surface, he is sensitive, empathetic, and warm-hearted, though his reserved nature can make him difficult for others to read. He can be impulsive at times, preferring to follow his instincts, and he is sensitive to criticism. Once he decides on a course of action, however, he is determined to follow it through. He tends to value peace and harmony, working to avoid conflict and keep the mood among his colleagues light and balanced.

His relationship with Aoi Tokura is one of the central threads of his story. Rain initially appears indifferent to Aoi, but the two gradually bond over their shared passion for coffee and develop a genuine friendship. He also shares close connections with the other baristas at Rainy Color and with the café's owner, and he is valued as a dependable member of the team.

In the Hawaii season, Rain is among the familiar faces who take part in the café's expansion to a new location, supporting the new branch and its staff. His most notable abilities include his craftsmanship as a barista, his musical talent, and his capacity to form deep, genuine bonds with those around him through his quiet empathy and his willingness to help others.