During the summer break of her third year of university, Aoi is interning in management at the Kyoto National Museum when she receives a phone call from Yilin Jing, who found Ensho's paintings displayed at an art gallery in Hong Kong.

What will Kiyotaka and Komatsu find when they fly there in search of the man who disappeared without a trace? And what did Ensho mean by his elusive parting words?