GA: Geijutsuka Art Design Class: Slapstick Wonderland

Mari is aboard an airplane bound for Japan, carrying a sketchbook once owned by her late grandmother. The sketches on it were done by her grandmother before she died, reminiscing about her time in Japan. Mari committed her grandmother to color the drawings. What will Japan be like, the land that Grandma adored? Mari falls asleep, filled with both wishes and concerns. GA (Geijutsuka Art Design Class) is where she is going as a short-term overseas student. What kind of story will unfold if Mari and the members of GA are cast?