"Sketchbook ~full color'S~" is a slice-of-life anime that centers on the daily lives of a group of high school students who are members of their school's art club. The protagonist, Sora Kajiwara, is a shy and introverted girl with a passion for drawing. Her quiet demeanor contrasts with her vivid imagination, which she expresses through her sketchbook. Sora's interactions with her classmates and friends form the core of the narrative, offering a gentle exploration of their shared experiences and individual growth.

The series features a diverse cast of characters, each with distinct personalities and interests. Kate Ohara, a cheerful and outgoing transfer student from England, becomes one of Sora's closest friends. Kate's enthusiasm and curiosity about Japanese culture often lead to humorous and heartwarming moments. Other members of the art club include Nagisa Kurihara, the club president who is serious about her artistic pursuits but also has a playful side, and Asaka Kuga, a laid-back and observant girl who often provides subtle guidance to her peers. Ryou Fujisawa, the only male member of the club, adds a different dynamic with his calm and supportive nature.

The plot unfolds through a series of episodic vignettes, capturing the mundane yet meaningful moments of the characters' lives. These include their activities in the art club, such as sketching landscapes, participating in school festivals, and collaborating on creative projects. The narrative also delves into their personal lives, showcasing their hobbies, family relationships, and interactions with other students and teachers. The tone is consistently lighthearted, with occasional moments of introspection that highlight the characters' aspirations and challenges.

Throughout the series, the art club serves as a backdrop for exploring themes of friendship, creativity, and self-discovery. The characters' shared love for art fosters a sense of camaraderie, and their individual journeys reflect the universal experiences of adolescence. The anime emphasizes the beauty of everyday life, portraying ordinary events with a sense of wonder and appreciation. The absence of a central conflict or dramatic tension allows the story to focus on the subtle nuances of human connection and the joy of pursuing one's passions.